After the murder of an undercover agent, sworn enemies Bob Lemmens and Ferry Bouman must work together to roll up Serkan and Leyla Bulut’s Turkish XTC-network. After the events of Season 2, Bob has been fired from the police department and a court case and possible prison sentence are looming over him. Ferry is released from prison, but finds out that his place at the top of the XTC-world has been taken over by a new, stronger and smarter gang which is led by the Turkish couple Serkan and Leyla Bulut
When a young undercover agent is murdered, the police realize that they have a mole in their midst. Patrick Diericks has a proposition for Bob: he can make his court case disappear if Bob goes undercover again to infiltrate Serkan’s gang as a civilian informer and unmask the traitor. Bob reluctantly takes on this life-threatening mission in order to get his life back on track and secure a future with his new family. But then he comes up against Ferry Bouman.