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.

Samy goes deep undercover with the Larbi gang. The police are closing in on Aziz, but as usual nothing is straightforward. Josephine Karlsson is up to her neck in the dealings of the Larbi gang. Clement plays a clever game behind the scenes.

As Samy's undercover operation nears its conclusion, the team prepares to arrest the Larbi brothers - but an unforeseen complication occurs and the detective's identity is called into question.

Samy tries to allay the suspicions of the Larbi brothers as the operation reaches its conclusion while Karlsson continues to walk a fine line. Last in the series.