Boyden spearheads a raid on a brothel, which uncovers several illegal immigrants from Croatia being forced to work as prostitutes. The owner of the premises, Carson, agrees to reveal who is bringing the girls into England in exchange for a lesser charge. However, on the way to court, the police van is ambushed and Carson is kidnapped. After the car used in the ambush is found with blood stained seats, it is suspected Carson has been killed. Carson's lawyer, Doyle, eventually agrees to set up a meeting with Luca, and Boyden sets up a surveillance operation on a locker. Meanwhile, McCann agonises as he waits for word on a transfer that hinges on the result of his Sergeant's exams.