Detective William Wisting has spent years solving the cases that others can’t.

But when his daughter, Line, unearths information about the little-known past of Adrian Stiller – Wisting’s replacement as head of the Cold Case Unit – including the mysterious disappearance of Stiller’s high school sweetheart, Wisting trusts Line to follow the trail. Wisting is looking forward to taking a step back. When his former boss dies, however, Wisting suspects foul play was involved.

Particularly when a link to Stiller and another cold case emerges…As secrets come to light, new and old threads intertwine – and at the centre of it all stands Wisting, who alongside his daughter, must solve one last case.