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.

When her car breaks down on the way to the station, DC Viv Martella misses an important CID briefing about an obbo on a suspected armed robbery, and is furious when she is taken off the case by DI Frank Burnside. As CID and SO19 wait outside the target, Martella and PC Tony Stamp follow up a simple case to arrest a suspected bag snatcher. As they wait outside the suspect's house, a van pulls up, obscuring their view. Having missed the briefing, Martella fails to recognise the van's occupants as the armed robbers, and when she approaches their van she is shot and killed. Stamp is wounded, but manages to give a description of the van which is spotted by a traffic police motorcycle. As the India 99 police helicopter and SO19 cars pursue Martella's killers across London, PC Loxton and WPC Ackland disobey Ch. Insp. Cato's orders and pursue the suspect vehicle in the Area Car. The vehicle hits a bulldozer and explodes, killing all inside.

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.

Yorkie is on hand at the scene of a fatal accident. Everyone is being held up and Yorkie is stressing out. Petrol is leaking from crushed car which has dead occupants. Sgt. Penny, when he finally arrives, tells Yorkie off for not blocking off the road. When Yorkie goes to move a bus on, he discovers the bus driver is the husband of the driver of the crushed car. Yorkie is in shock and Viv is worried about him. Cryer seems to be the only one who understands. Yorkie is talking about giving up.

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.

With a gun to Harman and another on him, Nadir is forced to admit he is undercover. As Haskew, Shaw and Nadir dispute on whether or not Nadir is actually bent, Alvarez silences the room by shooting informant Eva Garcia. As Haskew drags Harman and Nadir to the drug deal, Nadir explains all to Harman, leaving her disgusted. With SOCA at the wrong location, the lorry is intercepted with it continuing in the wrong direction, but it is a bust. Nadir proves to Alvarez that the police are going to the wrong place to regain his trust, but he loses Haskew's when he tries to shoot him in attempt to stop Haskew killing Harman. A heart to heart between Nadir and Shaw sees them decide to elope with the cash, but not before CO19 storm the deal and engage in a firefight. As bullets fly and bodies drop, the Sun Hill team are left looking for their own in the casualties.

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.

P.C. Stringer tries to stop some children from playing 'chicken' on the railway line, but one of them is run down by a train. Sgt. Peters transfers upstairs to the post of duty sergeant, swapping roles with Bob Cryer, who returns to the relief.

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

D.S. Greig is led to a vice ring when searching for a missing thirteen-year-old boy. D.C. Dashwood and W.P.C. Ackland are brought into an operation against ponces running rent boys.

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.

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.

It's the day of reckoning for CID when they finally get suspected paedophile Clive Inverdale into court, but the situation goes from bad to worse when the court is stormed by a masked man with a gun, and Inverdale is shot dead. To make matters worse, Meadows' prime suspect, Ron Gregory, has an alibi in the form of none other than Hunter. With Sinclair also out of the picture, the investigation looks to be heading nowhere. Meanwhile, Osbourne and Hollis investigate several cases of stolen masonry, including one where the owner was brutally attacked during the robbery. A search of a derelict building for the stolen goods yields much more than expected when Joanna Sharpe is found alive.

DC Eva Sharpe is relieved when her daughter is found alive, although what ordeal she has been through remains unknown. The paedophile investigation into the charity ""Global Families"" continues, as the officers try to identify a dead child. PC Cathy Bradford is jealous when DC Brandon Kane starts dating a doctor. DC Drummond's son sees him meeting his mistress, and DS Phil Hunter continues to play off villain Ron Gregory and DCI Jack Meadows against each other.

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A student nurse is sexually assaulted. D.I. Burnside arrests the obvious suspect, but he escapes from police custody.

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

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.