The mysterious north African, Samy, arrives from Special Branch to help with the investigation into the Larbi crime family. Aziz is still out of control and finally pushes one of his young gang members too far - the team are called to a street shooting and the perpetrator is a sinister teenager.

As Samy's undercover mission nears its conclusion the team will soon be ready to make their swoop on the Larbi brothers - but an unforeseen complication throws the operation off the rails.

Is Samy really who he says he is?