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.

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.

Stamp and Keane race into action after finding Smithy's IRV on its side following the assault by another vehicle. Back on the estate, a full blown riot breaks out, orchestrated by Raheem Woods and other members of the Creekside Boys. Roberts finds himself attacked and abducted by the street thugs, leading to a daring rescue to shut the riot down. Late evidence changes the entire context of the case, but with the trial falling apart, can they secure justice for Carly in time?

Callum is determined to catch the bomber but the team receive a message saying another bomb will be achivated in 3 hours. The bomb is traced to a mother taking her children to school. Mickey manges to get her to safety,but when Callum goes back to the car to save her baby the bomb goes off.

Smithy continues to work undercover and finds himself getting in deeper with Darren Cutler, Kieran Wallace, and Tommy Rose. Darren soon works out that he might have been crossed though.

Smithy continues to work undercover. He meets with Bob Gatting who is the leader of the SE1 gang. Kieran Wallace is beaten up by Gatting's thugs. Stevie poses as Smithy's girlfriend. During a confrontation Smithy is forced to reveal his true identity.

A box of fireworks goes of in front of Beth and Will's police car. Jason Patterson is caught having committed the crime. They learn that the boy's step father is at a football game with the rest of the fireworks.

CID and CEOPs go all out to stop the live feed abuse of an 8-year-old boy. With Det. Supt. Faraday working with Heaton and CID at Sun Hill, Dasari and DI Ashley look through the image of the victim for information of his whereabouts. Noble becomes FLO to the mother, when the boy's drug addict brother is revealed to have given a photo to the paedophile network. With the case hitting close to home, Noble requests a leave of absence to spend time with her son.

Carly dies in hospital after been shot and Smithy feels bad. Maurice Thompson gives the police some information about the shooting but they discover he has been lying. Alisha who was Carly's best friend tells Smithy that Marlon Reed is after her boyfriend. Marlon is found pointing a gun at the head of Tito Morientes.

Sally and Ben are surprised when they find a young boy behind the wheel of a stolen car belonging to a local villain. A briefcase in the car opens up a whole new mystery.

Beth goes undercover in the hope of busting a drug dealer.

Ben and Tony find a distressed young girl whilst looking around a derelict building. The body of another missing girl is also found there. Stuart is stabbed with a syringe when he attempts to talk to a suspect in the murder case.

When arrested Danny Peters claims that the syringe contained the HIV virus. Stuart is upset when Jack agrees to say a good word for Peters in court in exchange for helping to bust a major drugs smuggling gang.

Emma and Sally attend the home of a family who claim there has been a break in. Tony and Sally discover one of the robbers in a bad way. The father of the house Tim is arrested for attempted murder when it is revealed that he hasn't been completely truthful.

Sally and Ben attend the scene of a hit and run. The investigation becomes more complex as it continues.

Smithy come to the aid of a man who has been attacked with a knife and he gets a description of the man who did it from a young girl he has been helping. The man is beaten up by her boyfriend and she tells Smithy that she is afraid of him.

After a local health centre is broken in to Diane and Nate find Dr Adam Tyler badly beaten inside. CCTV footage shows Brendan Connor a local drug addict taking stuff from the drugs cabinet. Brendon admits to taking the drugs when questioned but is adamant he didn't beat the doctor up. The team then find out that the beating is linked to some illegal activities one of his colleges has been doing. Carly's mother tries to take her own life.

Will and Sally help a homeless man who has been hit on the head by a bag of cocaine. Ben discovers that Liam Harvey dumped the drugs and ends up in a fight with his father.

A young boy called Emile Grover is found with a loaded gun and brought into the statiopn for questioning . Emile says he was asked to look after it by Andre Tyrell. PC Mel Ryder is teamed up with Smithy on her first day. Emile's life ends up in danger after he goes missing.

The team worry that a copycat style child killer is on the loose after an eleven year old boy is snatched.

Smithy is called out to help a pensioner who has been mugged. It looks like a neighbour might not be telling as much as she knows.

Roger and Emma investigate after a 13 year old girl called Jenny attempts to kill herself. Jenny says that a man named Craig drugged her and then raped her. Phil discovers the man's real name after seeing CCTV footage where he is seen talking to a friend of Jenny's.

When the trial for Carly Samuels' murder kicks off, Dasari is surprised to find out that the defence barrister is her ex-boyfriend, Sunil Davdra. Key witness Joel Pearce folds after being threatened inside prison, causing Smithy to beg of Alisha Danniels to change her mind and come forward. Elsewhere, Masters and Moss investigate an assault on a pregnant woman, discovering it was ordered by her street thug boyfriend Raheem Woods. After smashing his face against a cell wall, Woods accuses Roberts of assault and is released. The cases cross paths when Raheem riles up the estate as Smithy, Alisha and Oscar leave for court, with all three left in danger.

Meadows launches the raid on Dwayne Fox's home, and Nixon coordinates one at Tito Morientes'. Tito is arrested, but Dwayne isn't home. Dwayne's mother Beverley breaks his alibi, but his boss kidnaps baby Brooke to increase the pressure on the team. Alisha Danniels’ phone signal puts her at the scene of the murder, and she gives another statement that reveals there was a third man in the car, turning the case on its head.

Alisha Danniels is left fighting for her life when she is hit by a speeding car after being taken home from the station. A chase ensues, but the car escapes down railway lines before being found on fire. With the fire quickly extinguished, there is hope for the investigators. The car leads to two investigations as Roberts and Keane try to track down a teenager who fooled the owner in order to car-jack him. When the boy's older brother leaves mid-interview, Alisha identifies him as the driver of the drive-by car. Refusing to give a statement, Dasari and Smithy discover Alisha's dad Oscar knows where he is. As part of the forensic check of the car, bullets are found in a hidden compartment of the boot, so Carter tracks the owner in order to bust him selling them on.