In the heart of London, an anonymous phone call draws two brilliant detectives—a young woman in the early stages of her career and a well-connected man determined to protect his legacy—into a fight to correct an old miscarriage of justice.

In season two, when a young man is stabbed to death at a political rally, rival police officers June Lenker and Daniel Hegarty are forced into an uneasy alliance. But what starts as a hunt for a murderer escalates into an undercover operation to foil a far-right bomb plot in the heart of London.