Daniel Milton is a respected surgeon who starts operating an illegal clinic underneath London's Temple tube station after being driven by a personal tragedy.

Daniel desperately races to track down Anna after she makes a daring escape from the bunker. He must find her and explain himself before she reveals his secret.

Lee and Daniel struggle as they attempt to deal with a particularly dangerous and difficult patient. Plus, cops and criminals alike begin their hunt for Jamie and the robbery money.

In order to find a scientific breakthrough before it's too late, Anna and Daniel work closely together. Plus, Lee's brush with love inspires him to help Jamie get in contact with Michelle.

As Daniel enters the dangerous world of organ trading, his descent reaches new depths. Plus, Jamie makes an error as gangsters and police close in.

As Daniel struggles to deal with his actions, Daniel spirals out of control. Plus, other relationships start to unravel within the bunker.