P.C. Ken Melvin and P.C. Reg Hollis stop a young man for erratic driving, and a PNC check reveals the expensive car is stolen. Stamp and Quinnan arrive to transport the prisoner to Barton Street, and Melvin and Hollis volunteer to drive the car back to Sun Hill. As Melvin moves some of the building materials from the station renovations so he can park, the car explodes in a huge fireball. Hollis, Conway and Melvin are rushed to hospital - but Ken Melvin soon dies from his injuries. SO13 arrive at Barton Street to interview the car thief, who it turns out stole the car from an army major who was a likely terrorist target. Sgt. Cryer is outraged that the disaster could have been prevented as SO13 had the major under surveillance and could have stopped the car being stolen.

Quinnan and Stamp go to Whitegate Estate to arrest a man involved in a glassing the night before. When Peters tries to apprehend the assailant, he is stabbed and rushed to hospital.

Two explosions happen whilst Emma and Sally are out on patrol. With many casualties Callum takes control of the situation. Emma learns from Jack about another possible bomb and as she tries to evacuate a building it goes off.

Santini goes on trial at the Old Bailey accused of the murder of Jessica Orton, but tries to talk to CIB and implicate Quinnan and Rawton. A prison guard tells Santini that Sherman's drugs charges are being dropped in favour of conspiracy to murder Santini and Fox, who turns up dead in her hotel room after an apparent suicide. With Ferguson executed and Timpney taken on side by Sherman's heavies, Santini's trial starts falling apart. Hagen is discredited by her Sun Hill colleagues when she lies under oath and breaks down in the witness box after being caught out. With Santini found not guilty, he is warned by his recently released cellmate that he is in grave danger from Sherman's heavies.

It's the day of P.C. Ken Melvin's funeral, but the men and women of Sun Hill still have a job to do. P.C. Stamp volunteers to do a reading at the church service. W.D.C. Martella is annoyed when D.I. Burnside keeps CID out on an obbo when the funeral service is about to start. Two old friends turn up at the church: P.C. Taffy Edwards, now in the Wales Police, and Yorkie Smith, now working for a security firm. The funeral goes off without a hitch, as Sun Hill pays its last respects to one of its officers.

PC Eddie Santini tries to convince his lover, Jess Orton, to set him up with some drug dealers - he wants out of Sun Hill, and DS Timpney, his friend in Area Drugs, has promised him a place in the squad if Santini can get him evidence on them. At parade, Sgt. Bob Cryer assigns the relief a door-knocking campaign to warn the elderly residents of the area about two bogus callers posing as social workers who are responsible for a string of robberies. Leaving PC Hagen to cover for him, Santini meets Jessica, but not before hearing the culprits have been following the local Meals-On-Wheels van. Jessica has met up with an old friend, Ferguson, who is a big-time drugs importer. She wants Eddie to pose as her husband when they next meet to seal the deal. When Eddie returns to duty, Cryer is furious. An old army Major has had all his medals stolen by the bogus callers, and Santini had neglected to warn him. A desperate Santini gets Hagen to investigate the Major, and finds his claim is a scam.

PC Nick Klein is back in the safe house, but when DS Phil Hunter gives the address to Dennis Weaver, a hitman is contracted to kill Klein. Meeting with the hitman to retrieve the gun and a photo of Nick's body, Weaver realises Hunter has set him up when the police lead by Supt Okaro and DCI Meadows swoop in on them. Escaping into North Canley Forest, a terrified Hunter barely escapes with his life as a maniacal Weaver swears revenge for his treachery. With Weaver on the loose, however, Nick Klein is relieved of duty and placed in deep witness protection far outside of London, but not before Hunter and Sgt Dale Smith have a chance to clear up their differences with him. Police Staff Polly Page investigates a forged drivers licence, but is reprimanded for exceeding her remit as a civillian staff member. Polly visits Cathy Bradford in a secure psychiatric unit, where Cathy tells her she is ""undercover"" in the hospital. Considering recent events and Bradford's taunts, Polly resigns from Su

Ackland uncovers a series of muggings. Johnson is unimpressed, but Monroe, acting on Ackland's information, organises an observation on a pub.

Carver is let down by an unreliable snout, and needs Beech to get him out of a tricky situation.

DS John Boulton is determined to catch a pair of brutal thieves, and he is certain that local crook Mick Glover is one of them. Ignoring protests from Uniform, who already have Glover under surveillance, Boulton leads a disasterous raid on Glover's flat, which puts PCs Quinnan and Garfield's informant Janie in grave danger. When Quinnan and Garfield find Janie's flat on the Jasmine Allen estate vandalised, Quinnan pursues the suspects, but finds himself seperated from Garfield, who can only watch in horror as his friend is beaten and stabbed by a gang of youths.

Insp. Monroe has trouble dealing with a gang of boy-racers who are harassing and intimidating an elderly couple. When the old man dies after an altercation with the gang, Monroe is urged by Brownlow to show 'zero tolerance' to the youths. PC Smith gets close to a nurse at the St Hughs Nurses Home while investigating reports of a stalker in the area.

Stop and search is resumed when there is an outbreak of street robberies. Mannion asks Brownlow to stand in for him for a TV interview, but he ends up shifting blame after two undercover journalists are subject two stop and searches. With the relief furious at their chief, Brownlow joins Conway on the beat in the C.I.D. car. They respond to a call and collar one of the street robbers, but when the other robber hops onto a bus and Brownlow gets uniform to stop the bus, he comes under public criticism, although uniform can only see the funny side.

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Boyden, Ashton and Santini head out for a night in a club, and Boyden bets his PCs that he can pull any girl in the club. Approaching an attractive young blonde, he ends up taking her home. The following morning, Boyden attends an assault on the girl's stepfather and discovers she is only 15. The case soon escalates when the girl's younger sister claims she has been abused by her stepfather's friend, and when Boyden's conquest runs away, she tracks him down and demands he provide her an alibi for the assault. When Boyden refuses, the girl is arrested for trashing a pub, and uses the interview to mention her night of illegal passion with the Sun Hill lothario. As CIB interview Boyden, Hagen is tasked with taking the girl to a children's home, but she cons her way out of the car and runs off. An off-duty Boyden then goes after the girl, but is unprepared for a discovery during his search.

Meadows recruits Quinnan and Rawton to receive a notorious sex offender, Ray Ballantyne, from another division. However, the DCI's hopes of keeping the Ballantyne's identity a secret are quickly blown by a press leak. As a protest takes place outside the safehouse, Hagen receives a call in CAD that a local boy, Andy Donnelly, has gone missing. TSG are drafted in to take Ballantyne out of the house and back to Sun Hill, as the protest escalates into a low-scale riot. Meanwhile, Page and McCann interview Donelly's friend, he gives a vague description of a man seen with the missing boy that matches Ballantyne. As the protest shifts to Sun Hill, Ballantyne is interviewed about his involvement, and he confesses to seeing Donnelly and comforting him. As the boy is tracked down after hiding in an abandoned train, he makes a shock confession about his home life. Back at the station, as Rawton struggles to find a hostel for Ballantyne, a dramatic twist brings a final resolution to the case.

With PC Quinnan in a critical condition in St Hugh's Hospital, the police descend on the Jasmine Allen estate, determined to catch those responsible. PC Garfield manages to identify most of the gang, and a young boy, Kevin White, bought in for questioning names them as the 'Sun Hill Massive'. Garfield and DS Boulton come to blows when Boulton denies any responsiblity for the attack on Quinnan. Acting on a tip-off, the police raid Mick Glover's flat again, finding he is responsible for the burgleries, and that his son Ben and Kevin White were the ones who stabbed Quinnan.

Vicki Hagen finds Eddie Santini's tickets to Amsterdam, and questions him about them, but he is evasive. DCI Pallister takes DS Fox off the Jessica Orton case after her accusations against Santini, but she decides to do some investigation of her own. Santini, meanwhile, acquires a gun and some Class-A drugs to plant in Ferguson's boss's house when DS Timpney and the Area Drugs Squad raid it. Fox stumbles upon the house and is captured by Ferguson. His boss Mr Sherman is displeased that Santini allowed a police officer to find them. When Area Drugs arrive at Sun Hill for the raid, CID realise that both Santini and Fox are in trouble. Sure enough, Ferguson's radio scanner warns him of the forthcoming raid and he locks Santini in the same room as Fox. The two argue, but are pulled apart when Santini attacks Fox. She manages to escape, and Sherman's men are intercepted by SO19. Back at Sun Hill, Fox realises the keys in Hagen's possession are Jessica Orton's - and she arrests Santini for m

PC Jim Carver returns to duty after undergoing treatment for his alcoholism. Unfortunately for him, he is paired with PC Dale Smith and their first case involves alcohol! Attending what first appears to be a racial assault at a post office, Carver uncovers a scam to sell thousands of pounds worth of illegally imported alcohol to off-licenses. Smith and much of the relief don't trust him, and after a Customs raid on a off-license which turns out to be an empty building, Carver must go out on his own (and on his own bicycle!) to find the person behind the scam.

Boyden has a near miss on patrol when a van in front of him collides with a teenage girl. Her friend is identified by a mall security guard as a shoplifter, and after refusing to give her details, Boyden is shocked to discover the girl is Monroe's daughter Jackie. Boyden supports his boss through the ordeal, drawing on his own recent experience with his daughter Amy. As the relief rumour mill goes into overdrive, Monroe demands harsh action for Jackie to silence the officers claiming she will get off lightly. Monroe gets a reality check as he realises how badly fractured the relationship with his daughter is, and is determined to help her when she later goes missing. When Page finds drugs on Jackie's friend, Brownlow intervenes amidst media pressure about the fatal overdose of a teenage girl from Jackie's school, but has further media pressure to deal with when Jackie's arrest becomes public knowledge.

Becka Davis is found upset and she later tells Mel she was assaulted in her own home. Jeremy Williams is questioned about the assault and it is discovered that somebody has been pretending to be her on the Internet. Smithy works undercover to expose a gun running outfit.

Boyden deals with a frail old man brought into custody accused of attempted murder.

Beech's involvement with rival racketeers becomes more complicated.

Deakin's surveillance on convicted kidnapper Frank Tully's release from custody is immediately blown out when Tully spots them, revealing his already released partner in crime told him he was also under surveillance. Deakin then confronts his partner, Richard Hackett, demanding information on a missing ransom payment from a kidnapping 8 years earlier. Deakin sends Holmes undercover as Hackett's girlfriend, but when they set up an observation, Tully pulls a gun on Hackett and Holmes after discovering there is no money in their safety deposit box. Tully is arrested when Hackett reveals the gun is empty, and suspicion turns to bank manager Roger Carlson, who decided to go on holiday the day of the raid. However, when all he is found with is a small bag of heroin in customs, they discover he may have been framed for someone else to steal the money without Hackett or Tully's knowledge.

A suspected armed robber dies after his car crashes during a chase with police. He is identified as Alain Savoie, a French national, and the body of an English woman is found in the boot of his stolen car. The woman is identified as Carol Archer, and scorch marks on her back indicate she was electrocuted in her bathtub, and Savoie was trying to dispose of the body. According to Carol's mother, Carol's husband Peter was in France looking for her. DI Chris Deakin, a fluent Francophone, suggests they send officers to interview Savoie's sister in France. DCI Jack Meadows insists on making the trip himself, and Deakin suggests he take DC Rod Skase with him. Once they are on the ferry, Meadows and Skase realise neither of them can speak French. With some trouble they manage to find their hotel, and despite the language barrier, Meadows clearly hits it off with the landlady Claudette. CID hear that Peter Archer is headed back to England, but he does not board the ferry, and Interpol reports t

Insp. Monroe is skeptical but cautious when a young woman, Emma Crawford, rings Sun Hill and says she thinks her boyfriend may have hidden a bomb in the station. At Emma's flat, Ackland and Stamp find bomb-making equipment and a faxed warning due to be sent on a timer. PC Carver discovers a suspiscious paint can hidden in the ceiling - enough to trigger the evacuation of the station and the calling in of the Bomb Squad. The suspect, Ben Wallace, has been in trouble with the police before, and he is apprehended by DCI Meadows when he returns to the flat. As the Squad begin defusing the bomb, Ackland and Stamp visit Ben's parents whom he despises. The bomb is dismantled and the station declared safe, but Ackland and Stamp watch in horror as Ben's father is killed by a car bomb planted by his son.