An anonymous phone call draws two brilliant detectives into a confrontation over an old murder case โ one a young woman in the early stages of her career, the other a well-connected man determined to protect his legacy. The series touches on issues of race, institutional failure and the quest to find common ground in a polarized Britain.

An anonymous call puts Detective Sergeant June Lenker in the path of the formidable Daniel Hegarty.

Convinced there's a link between the emergency calls, June sets out to prove a theoryโbut Hegarty stays one step ahead.

A horrific incident lands June on Hegarty's team, giving her a way to win his trust while secretly digging into the Errol Mathis case.

Pressure mounts on June from all sides as she makes a breakthrough in Errol's case.

June's personal life suffers collateral damage when her son is targeted.

A shocking revelation compels Hegarty to find his daughter. June uncovers a game-changing piece of evidence.

The events leading up to Errol's 2011 arrest reveal a hidden history.

Season finale. A wave of public outrage pushes Hegarty and June to work together before it's too late.