The gruelling investigation of the attacks on the Mt. Thomas police continues, as Tom heads to Melbourne to investigate the man who sold the parts for the bomb. He links it to chemical dealer 'Doc' Parkinson, and is determined to prove that he provided the Baxters with supplies for both the bomb and the speed. Although Nick seems to be against this idea, he does join PJ and Amy - who everyone at the station is very impressed with - on another search of the Baxter property, during which time he plants listening devices in their home - which ultimately lead them to discover the truth. On a doorknock, Jonesy and Susie rescue an attractive woman named Donna from a rubbish skip she has been locked in, and Jonesy falls for her. That night at the pub, her former de facto lover hits him, and then claims that Donna took all his possessions, and is a con artist. Ben has been fawning over Susie a little too much, buying her expensive gifts, and she ultimately gives them back and leaves him unsure

Joss attempts to break things off with Fay Tudor but she doesn't agree. What he soon realises however, is that he is attempting to break off with her because he actually likes the relationship for once. Kelly is riding high after she gets payback on sleazy Sergeant Holland, but it isn't long before he is trying his old tricks on another young woman named Shayleen, who is only 15. Tarni Baxter returns to town, and Tom is certain that she is desperate for vengeance after Tom's arrest of her family. While he and Tarni square off, he arrests her boyfriend Ryan for possession of drugs, only Mark is suspicious that he planted the drugs himself. Tom arrives home that afternoon to find his dog, Digger, viciously murdered. Kelly realises that Roy is dangerous and makes a formal complaint to Tom, who agrees with her and suspends Roy, who then threatens him. The next day Tom's rental car is found on a deserted road, completely destroyed by fire - and with a charred body at the wheel.

Mt. Thomas is inundated by a group of footballers, and it isn't long before a gang rape occurs, but what no one expects is for Tom's stepson Daniel to be implicated. Amy, in particular, seems to be particularly emotionally involved with the rape case. Meanwhile, Ben starts a dangerous spiral as he realises that Susie has truly rejected him, and he convinces himself that he is a failure as a policeman. While Ben contemplates suicide, he ultimately makes a noble choice by resigning and going to be with his children in Perth.

As the rape investigation continues, Inspector Draper arrives in town - worried that Tom is running amok. While Daniel evantually agrees to a DNA test, and is proven innocent, Tom loses his stepsons as they leave to live with their grandparents. Meanwhile, Joss, Jonesy and Kelly deal with a snake problem.

When PJ's old nemesis Luke Darcy (see season 4's ""The Civil Dead"") is freed from jail, he returns to Mount Thomas and PJ instantly believes he is bad news. After a bashing, and then the rape of Luke's own grandmother, the evidence points elswhere but PJ's suspicions - and the suspicions of Luke's cousin - lead him to force his anger onto Luke. Meanwhile, Susie and Ben - who have each spent months in therapy - talk about their issue and Susie begins to think Ben is ignoring it, rather than confronting his feelings about killing her husband. After Luke attempts to rape and kill Jo, PJ angrily heads to his house. When the others arrive they find Luke dead with an axe in the head - and PJ standing over him...

PJ refuses to explain how he came to be standing over the dead body of Luke Darcy, forcing the Homicide Squad to arrest him for murder. The other Heelers must prove his innocence and find the real killer. Meanwhile the Heelers get a surprise when Jo finds out that she has been promoted to Senior Constable, when her strips and badge come in the mail. And they also find out that Ditch is the father of Kayla's baby.

Tension is rife in Mt. Thomas. Joss and Kelly interrupt a girl who goes crazy in a store, and later find out that bad speed is being sold in the town. PJ and Nick are on bad terms over what they think of Tom's intentions, and Amy is just trying to get someone to let her help. Ben and Susie are acting professionally around each other, and Jonesy is annoyed about their dalliance. After clearing up the confusion about which Sergeant is for what (Ben is for Operations, Mark is for Administration), the DNA report comes back which concludes that Troy Baxter did meddle with Grace's car but, to prove he raped Grace, they must stop the funeral and take his body for DNA, which angers the Baxter family. Although it is proven that Troy did rape Grace, PJ begins to side with Nick that Tom may be overdoing it to suggest that the Baxters bombed the station. And - after Tom verbally assaults Barry Baxter - and suggests they are selling speed as well, PJ earnestly believes he has gone over the edge. In

After an old lady is mugged, tension builds in Mt. Thomas. Thanks to Clancy, an eye-witness of the event, suspicion rests on a new family in town: the Baxters. The adult children, Matt, Troy and Tarni are brought in but nothing can be proven. Their father Barry, a softly controlling man, comes to bail them out and shortly afterward, Clancy is bashed. The cops link it back to the Baxters and end up arresting Troy when a brick is thrown through Tom's window. However, at the same time, an old war veteran named 'Rocket' Turnbull who served with Tom is in town, and has publicly threatened Tom. Meanwhile, Ben is attempting to play relationship advisor with Jo and PJ, until she confesses to him that the reason they split is because of Maggie. PJ thinks they can still work together, but Jo has asked for a transfer. A new day dawns in Mt. Thomas. Grace and Jo are distraught when Cal Millic, a man who they were helping in a custody battle, loses, and refuses to give his daughter back. Jo is forc

The cops attempt to come to terms with what appears to be Tom's death. Amy suspects suicide but PJ thinks otherwise and, upon learning that Tarni Baxter had no idea of the accident, the two are set back a bit as to who committed the murder. What they don't expect is to find Tom alive in a seedy hotel, and although they attempt to help him, they soon realise that he may have been responsible for the death of whoever it was in his car. PJ and Kelly attempt to prove Tom's innocence but Amy and Roy think he may have gone over the edge. When they discover that Roy Holland is missing, it becomes likely that his body was in the car, and the knowledge that Tom suspended him, and that Roy may have suspected Tom of planting drugs on Ryan Dekker, leads Mark to accuse Tom of murder. Tom, meanwhile, is crazy with rage. He threatens Tarni by promising to plant her hair on the car and implicate her. However Shayleen Burke soon confesses that her father killed Roy after he discovered everything about

A woman who works out at the same gym as Susie and Jo is raped, and the Heelers suspect the gym owner when a witness cites sexual harassment. When looking through the local Internet sites, Jonesy discovers a porn site that includes the gym rape victims, and to her horror Jo as well. The race is on to find the rapist before Jo becomes his next victim.

Jonesy is missing, and the general consensus is that he has run off with Donna. Only Susie is suspicious, and rightly so - since he has been shot and wounded, and finds himself being held captive by Louis Chang. Tom is at first unwilling to believe Susie, and is too busy with the investigation into police corruption into St. David's. Frustrated, Susie has no choice but to go undercover unoficially and Ben - of course - agrees to help her. Tom and the team investigate Inspector Falcon-Price but the evidence soon proves that he isn't guilty, and neither is Lucy Wu - who both Amy and Jonesy were suspicious of. As the day comes to a climax, Susie and Ben find themselves in a dangerous situation which they survive, but she ultimately breaks up with him. Jonesy has to do the same to Donna, and has her arrested. And Amy is stunned to learn that her friend Andrew Reid is the real corrupt cop at St. David's.

It is the day after the explosion. The Mt. Thomas police station lies in ruins; Senior Constable Joanna Parish is dead, as is Clancy Freeman; and Grace Croydon is missing. While Tom recovers in hospital, PJ, Ben, Susie and Jonesy move into the new police premises where they are met with a surprise: Nick Schultz, now a Detective Sergeant in Homicide, has arrived to investigate the attack. And he's not the only one. Sergeant Mark Jacobs has arrived in town for a temporary post - or so he thinks. But Inspector Falcon-Price wants Jacobs to move permanently into Mt. Thomas, because he wants a person more suitable than Ben to take over when Tom retires. Jacobs is an intellectual, self-confident, ambitious man in his 40s and quickly shows authority as the group move into their new premises. PJ and Nick question 'Rocket' Turnbull, Tom's old war comrade, although he claims - and Tom agrees - that he couldn't get access to that much explosive. When Cal Millic - the father who threatened Jo shor

Barry Baxter is on assault charges against Tom, and Chris is angry because she was forced to lie for Tom. She confronts him and then tells Susie that Tom needs help. Before Susie can process this, however, she discovers a suspicious package in the foyer, and the cops evacuate. It is revealed as a false alarm, and a simple extortion tactic from a man in need of money, but the threat only heightens the panic in Mt. Thomas. Chris is attacked at the pub by a girl on speed, and Jonesy is interested to know who sold it to her. But the investigation quickly becomes overshadowed by the other events in town. Mark, Joss and Kelly begin to get used to the life of Mt. Thomas when they investigate an alleged break-in, only to discover that the culprit was an injured joey. PJ and Nick desperately attempt to prove Cal Millic is the bomber, and the media agrees with them. Millic begins to crack under the pressure of public opinion, but the situation only ends in tragedy when Millic takes his young dau

Jonesy is stunned when Donna tells him that the people who hired Theo to kill Hugo Allen were in fact the police of St. David's. As he goes about investigating secretly, he learns that the police have not been caring about Allen's disappearance. When Amy finds out about his investigation, he is forced to get Donna to talk to her. Donna confesses that Louis Chang, a restaurant owner in St. David's, runs an illegal casino from his restaurant and she was a call girl there. She was with Hugo when he found himself in trouble with Chang, and subsequently Chang had his police buddies order Hugo's death. She had a mobile phone with pictures of the casino on it, but it was stolen when Jonesy's room was ransacked. Amy believes Donna's story, but decides not to tell Tom in case he, too, is corrupt. Jonesy and Amy go to Chang's posing as a dating couple, but are interrupted by Inspector Falcon-Price and St David's multicultural police liaison Lucy Wu, who are also dining there. Jonesy suspects tha

Tom has a black eye, PJ and Jo are in a foul temper after a bush walk goes wrong, Ben and Susie are frustrated after they chase a non-crime, and only when Jonesy reveals his adventures with a new Constable in Widgeree does PJ realise that they all hold a piece of the puzzle which may lead to the recovery of a quarter of a million dollars in stolen loot.

Susie and Evan find a young boy near death during a spate of alcohol robberies at the Imperial. Chris injures herself when she chases after the robbers, and Jones, feeling responsible for not coming to her aid when he had the chance, hires another bartender. But is he part of a gang who is forcing alcohol onto the young?

Troy Baxter has been crushed underneath a car at his property. Barry blames Tom and, while most of the cops brush this off as grief, Nick thinks it may be true. As Jonesy, Ben and Susie move things in to the new station, PJ and Nick focus on Cal Millic, who Tom thinks is just a distraction. Probationary Constable Kelly O'Rourke arrives. She's fresh from the Academy, ambitious and enthusiastic, and determined to prove her worth. Her father, who was an old friend of Tom's, died in the course of his duty as a policeman. However, her attempts to convey her sympathy to Tom end in him disciplining her. She is quickly aware that Tom Croydon is a changed man. Grace's autopsy report comes back: she was raped before, presumably, struggling to escape and falling into the river, where she drowned. Tom wants it kept out of the press, but it has already appeared on the radio. Jonesy and Susie pull over a speeder and discover it is Probationary Constable Joss Peroni. He's an enthusiastic cowboy who l

On their way to see the new constable who took over the station in Widgeree, Jo and PJ become embroiled in a case that involves aliens, Ned Kelly's saddle and a missing boy. They struggle to find out the truth when even the local police believe they had been abducted.

Joss discovers that Fay has a jealous husband and decides to break it off, until she makes him an offer; after a difficult confrontation, Kelly confides in Susie about Roy - leading to their decision to teach him a lesson; and PJ and Amy comes to loggerheads over who to arrest in a burglary and arson investigation.

When Susie finds herself escorting a pet alpaca to a funeral, she really begins to understand something about country policing. Unfortunately the recently acquired alpaca is the heir to a fortune, and suddenly all sorts of contenders emerge to make counter claims.

Jo reopens the case of a missing teenager when his mother claims to have seen him in the dead of the night. Jo senses that there is more to the case than she imagined, and soon finds herself involved in a web of lies.

Jonesy and Susie head to the site of an ecstasy overdose only to discover Jonesy's young brother Dylan, with the Drug Squad, got there first. Dylan loves to snub his brother because of their positions and soon leads an investigation into drugs in Mt. Thomas without listening to Jonesy's evidence. Jones goes after a brother and sister pair who he suspects, even though they are Dylan's friends, and his vigilance has even Susie convinced that he is just doing it to beat his brother. Meanwhile, a surprise 30th birthday party for Jonesy comes to a head when he fights with his brother, and they are seen fighting by Tom and Commander Jones - the boys' father. Later, Dylan collapses on the dance floor...

It seems a usual day at the office: Tom's fishing trip is yet again interrupted by Grace's job, PJ and Jo have decided that its time to tie the knot, and the usual slew of cases are coming in the door. However bliss gives way to suspicion when an old case drags up Maggie's memory and PJ begins to question his feelings for Jo. When PJ has to talk to a teenage girl to stop her from jumping, he reveals what he really thinks, leading to a shocking blow for Jo...

Despite allegations by her ex-boyfriend Theo that she isn't all she appears to be, Jonesy stays firm to Donna in trying to protect her. She soon moves in with him. Only Susie is suspicious of Donna, a suspicion seemingly confirmed when Jonesy's room is trashed. He arrests Theo, whom Amy recognises from her time in Melbourne - he was involved in an assault on a known drug dealer. Tom agrees with Amy, and refuses to give Donna police protection since she may be involved. Jonesy is not happy, pleading with the others and ultimately storming out of the station to go and personally protect Donna. The cops begin to consider that they've gone too far, but a defiant Tom stands firm - Jonesy had better come back, or he'll be out of a job...

Sgt. Roy Holland arrives in town and Joss takes the opportunity to get on his good side and do more than paperwork. While Joss investigates a mother who gave birth on the side of the road but soon is suspected of lying; Kelly bonds with Roy, who worked with her father as young cops. But soon things get out of hand when he makes a sexual pass at her. Jonesy finds himself against the law again when a friend of his is accused of murder.