A biker, Neil, attacks a blacked-out Mercedes in the aftermath of a road rage incident. The car accelerates off, crushing the motorcyclist's girlfriend Sal as it speeds away. She's left paralysed.

The squad suspects that the car's driver was a Code V. They trace ownership of the car to Lester Hammond, son of wealthy financier Gideon Hammond.

Meanwhile, Michael is struggling with his new role as state-sanctioned executioner. Frances urges him to quit while he still can. Kirsty is pressuring Michael to reveal the truth about Jack. Despite Vaughan's warnings not to expose his loved ones as Code V targets, it looks like Michael might capitulate.

Vaughan and Michael discover that Lester has been using his Code V powers to engineer profits on the London money markets. These profits have been flooding into Gideon's account. Gideon denies all knowledge. He claims to have lost contact with his son three years previously. When Gideon cashes in his entire investment portfolio, the squad turns the spotlight on Lester's former broker Danni. She will deliver the money to Gideon, where they believe Lester will pick it up.

Michael becomes suspicious of Lester's true identity. He traces Danni's senile mother and discovers she was once Lester's broker. Only Lester isn't Lester. His real name is Waldemar Hammerfetz and he is actually Gideon's father. Waldemar has been a Code V for almost half a century. When Gideon's son (the real Lester) died three years ago, Waldemar used his identity to re-enter society. As Gideon grew old, Waldemar remained a youthful thirtysomething. He has used Gideon's money to finance Code V research - specifically a clinic using human guinea pigs to test the effects of diseases and radiation on blood, the Code V food supply.

A delivery Danni makes to Gideon's residence proves to be a diversion. Lester doesn't show. And while the squad are occupied, the Code Vs are pulling out of the blood research clinic. Angie and Michael arrive to find the majority of the human guinea pigs dead.

Meanwhile Lester wants revenge. Neil's attack exposed him to sunlight and left him horribly burned. He murders Neil and traces Sal in hospital. He takes her as a Code V. Sal hunts Michael down. She warns him that he's on the wrong side. Before he can respond, Vaughan enters and kills her. Chastened, Michael returns to Kirsty and breaks off contact with her.

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