In Miami, Florida, a known assassin is asked to come out of retirement for one last task - to kill an Englishman. The only thing is, he has to do it dead. Back in England, Tom and Christine are enjoying their new relationship and share secrets. Christine pillow talks to Tom, telling him about the CIA's clandestine operation to 'desensitise' this assassin on English soil. But, no matter what, he must not tell Harry. Tom knows he cannot let this one be - a British life is at risk. He gets the team on the case but when every avenue they explore leads them to a dead end, Danny and Zoe begin to doubt the reason for Tom's actions and the whole operation. Has Tom set this whole thing up as a way out? Has he gone bad?