Brilliant, vivacious GP Gemma Foster has her life torn apart when she investigates whether her husband is harbouring a dark secret. The truth will shock her to the core.

Reeling from the secrets she has uncovered, Gemma has a decision to make - but a visit from a surprise patient means she also faces an acute professional dilemma.

In public Gemma plays the perfect wife, while secretly concocting a plan to ensure she comes out on top - only to make new discoveries about the full extent of the secrets that those around her are holding on to.

Gemma decides on a new start with Simon, but her medical career begins to fall apart.

Gemma is determined to expose Simon at last. But how far will she go to achieve her goal?

Two years after Doctor Gemma Foster dramatically exposed her husband Simon's betrayals, forcing him to leave town, her life is destabilised once again when he returns.

Reeling from the repercussions of Simon's return, Gemma scrambles to uncover his secrets and find out what's going on with Tom.

Gemma feels Tom should come first, even though she and Simon are at each other's throats. But can they put their own feelings aside for their son's sake?

Simon feels confident that he and Kate can finally live securely, free from Gemma's shadow. But can Kate really trust him?

Gemma goes to extreme lengths in order to come out on top and win back her old life. But this time has she gone too far?