A Brazilian man, Aguinaldo, steps off a plane bleeding from visible Code V bites. He is accompanied by his sister Maria, who asks for Dr Robert March, Angie's husband. The squad know that Robert's ashes reside in the incarceration chamber.

Maria reveals that Aguinaldo's 'doctors' cured his sickle cell anaemia with transfusions - only for the bleeding to start. They told her to bring him to London and ask for Dr March's help. Angie can find no trace of the sickle cell. She is baffled. Transfusions can't cure sickle cell.

Vaughan and Michael discover that Aguinaldo's plane was carrying a cargo of caskets. By the time they get to customs, a lorry has taken off all but one of the caskets. The casket is heavy but the X-Ray shows empty: a Code V. While Michael sets off in pursuit of the lorry, Vaughan takes the remaining casket into HQ.

Frances reveals to Michael that Kirsty has quit her job to become Jacob's research assistant. Michael asks Frances to arrange a meeting with Kirsty.

Michael tails the lorry, supported by an armed helicopter squad. Pearse is reluctant to have the lorry pulled over. He wants to see where the Code Vs are heading.

Maria is released - under Vaughan's observation. Maria takes him out to a deserted warehouse, where the customs official lies in wait. He's in the pay of the Code Vs. And they were expecting Angie.

Finally, Pearse allows Michael to pull the lorry over. But no caskets. The lorry was a decoy. Michael tries to warn Vaughan, but too late. The customs official knocks him unconscious. He wakes up inside the sealed warehouse. The caskets are set to open in eight minutes. Michael is twenty minutes away.

Vaughan contemplates suicide. Then he has a thought. He rips out the electronic lock on one of the caskets. As the casket opens, he fires and the Code V explodes, blowing open the doors of the warehouse. Vaughan escapes.

At HQ, the Code V has emerged from the captured casket. Pearse begins his interrogation. The Code V stone walls.

Angie has discovered that the Code Vs were testing synthetic blood on Aguinaldo. The Code Vs were tasting not feeding. Aguinaldo's bleeding shows the synthetic blood hadn't been perfected. They needed Robert to do that. With an alternative food supply to human blood, Angie speculates that the Code Vs might be looking for peace. Pearse disagrees.

Michael gets a message from Kirsty to meet him in a club. Michael fears something is different about her. Has Kirsty crossed over? He tries to get a reflection of her, but can't. Panicked, he draws his gun. Before he can shoot, he's jumped by the bouncers. Kirsty looks up and sees the gun - her worst suspicions confirmed. As Michael is dragged from the club, he sees Kirsty's reflection. She's not a Code V.

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