A surgeon's morals are tested after he sets up an illicit clinic beneath London to save his wife's life.
The clinic's secrecy falls into jeopardy when Daniel puts Beth's former colleague in an impossible position.
Daniel finds he's moving far away from the man he thought he was, as dealing with London's most dangerous people brings big problems.
Things grow complicated between Daniel and Anna as they battle to save someone they love. Lee takes a risk that endangers them all.
Daniel's descent reaches new depths as he enters the world of organ trading. As police and gangsters close in, Jamie makes an error.
Hall and Maloney get a break in their hunt for Jamie. Daniel faces the ultimate question—how far will he go for someone he loves?
Daniel crosses a line from which he can never return. Lee's forced to make a big decision about the clinic.
As Mercy and Keith close in, Daniel, Lee and Anna discover just how far they'll go to save themselves.
Daniel wants to forget the bunker ever existed and reunite his family, but when his wrongdoing catches up with him, he is in danger of losing everything. Meanwhile, Anna threatens to go rogue, Lee is faced with a crisis, Beth's recovery is tainted by suspicion, and Eve is leading a secret double-life.
A desperate Daniel and Lee deal with a dangerous medical fixer in the hope of solving their problems.
A desperate Daniel gets a lifeline as he and Gubby perform an operation at the foreign embassy. Anna starts to hunt for candidates.
A tormented Daniel is confronted with the consequences of his actions. Lee's horizons widen while Anna seeks results.
Daniel discovers the price of defying Gubby. Lee and Ash go on a reconnaissance mission, and Anna's behaviour comes to a head.
With trouble lying around every corner, Daniel and Anna go on a road trip that could change the course of their lives forever.
Daniel vows to fall on his sword. Elsewhere, Lee and Ash prepare to change the world.
