A night club peppered with bullets. Two victims bleeding out on the floor. The start of a deadly gun rampage through the streets of London. With the media swarming all over the case and a hostage to find, Matt and Ronnie are against the clock as they try to track down the Bonnie and Clyde duo wreaking havoc on the city streets. However, capture is far from closure when defence barrister, Phyllis Gladstone, takes the case on, arguing that one of the pair was more innocent victim than violent killer.

When Lia Brown is killed by a stray bullet, the team struggles to understand the involvement of 12-year-old Kaden Blake in the shooting. Kaden is caught up in the local gang culture, and keeping silent is his only protection. Matt is drawn to this damaged boy, saddened to see a life so doomed by circumstance and furious that local dealer and gang leader Mark Ellis remains untouchable by the law. Despite the gang culture of intimidation and silence, Kaden finds the courage to speak out - but in doing so, sets in motion a shattering chain of events.