Flashback. A young Claire - dressed for a hot date speeds down a country lane on her way to dinner at her friends' house.
Tom's the other guest. They're being set up and hit it off. The morning after, Tom catches a glance of thick hair on his arm. Or is it his imagination? Fast forward and the couple are the proud parents of twin boys - unexpected, as there was only one heartbeat.
At the institute something strange's going on. Tom's thumb print no longer opens the security doors.
Back to the present. The van pulls into the underground car park. A desperate Claire demands to know where her children are and why Tom's locked in a box. Peter retorts, what if your friend was the cure for cancer?
Meanwhile, Miranda rings Peter from the security gates, wanting to be let in. She demands to speak to Winston Churchill - the real one.
Elsewhere, Claire wants to know quite specifically what sort of relationship Katherine has with her husband.
