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.

Rivalry runs rampant between Chris and her opponent in the lead up to council elections. The community is split over a decision to ban men from the pools for Muslim women-only swimming sessions.

Ben faces a dilemma when he and his fiancée Marissa search for two homeless kids - the children of an itinerant drifter who collapsed during a pub brawl. Ben has already begun to suspect that he has met his match in selfless self-sacrifice in Marissa, but relations are strained when Ben realises that Marissa is hiding the kids. While most things work out well, Ben and Marissa soon realise that they don't have the trust to make their marriage work, and decide to call it off.

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.

Ben and Susie face the inquest into Brad's death. What is hoped to be a mere formality quickly becomes complicated when a witness makes damning claims against them both - including accusations that Ben and Susie were having a passionate affair.

P.J. and Jo run into a wall of silence when they investigate the allegation that a music teacher employed by the Mt Thomas Brass Band has been having sex with his under age charges. Tom seeks help from his parish priest, who finds himself constrained by a skeleton in his own closet.

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?

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.

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.

Tempers flare as a man the town is convinced killed his son returns when the courts find him not guilty. Jo and PJ keep an eye on the lynch mob at the Imperial while Susie, Jonesy and Tom keep the man at the station. Infuriated with the court's decision, Jones schemes of a way to bait the man into attacking him. But he is not the only one who is seeking to take the law into his own hands, as justice is demanded at the Imperial when Chris is held at gunpoint.

The Heelers are called to the local women's prison after a number of attempts had been made to break in, including a young boy who wants to see his mother. When a digital camera is found inside, the prison warden and director come under suspicion for hiring out the detainees for illicit purposes.

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.

A former AFL player for the Hawthorn Hawks is robbed, and takes an instant liking to Susie when he goes in to report the robbery. Jealous, Evan investigates hoping to prove the former football hero isn't as innocent as he claims.

Susie and Evan make the horrifying discovery of about 50 dead kangaroos, looking to have been ripped apart with an automatic rifle. As debates rage over whether or not to thin out kangaroo numbers, the farmer who owns the land where the dead roos were found comes under suspicion. He denies it and suggests a mate he served with in Vietnam might be responsible for it, thinking that slaughtering the kangaroos might send a message to not have a cull. As the Heelers dig deeper, it is discovered that a cache of weapons from Vietnam had been kept, but when they come to seize them, some turn up missing. Now the race is on to find the weapons and whoever might be holding them.

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...

Dylan dies of an ecstasy overdose, after convincing his father that he doesn't take drugs, and it was Jonesy's fault. Susie enlists PJ's help to see whether it was Dylan's friends or his colleague who spiked his drink. Although Jonesy tries to keep his family name clean, his father soon suspects him of being on drugs and Inspector Monica Draper arrives to investigate. So when Jonesy finds evidence that his brother himself was on drugs, he is torn as to whether he should take the fall, or reveal what his late brother was really like.

A middle aged doctor is murdered on the morning he is supposed to give testimony and Jo - having her own personal dilemmas because she fears that she has fallen pregnant to PJ - is emotionally thrown by the case. When she withholds vital information, however, Susie starts to worry.

A bungled police raid leaves Ben shot in the arm by Susie and a formal investigation looks set to find her guilty of shooting him out of payback for her husband's death last year rather than an accident, even though the Heelers are sure that she is innocent.

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...

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

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

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

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