Matilde Clausen, 9, vanishes from a crowded playground in the middle of Copenhagen, triggering a frantic search across the city. When a possible link emerges to the disappearance of Lea Høgh, 10, six years ago, DI Henrik Jungersen is thrown back into the nightmare that almost finished his career.

Desperate for redemption, but barred from reopening the old case, Henrik turns to his estranged lover, Dagbladet chief crime reporter Jensen, for help. As the investigation reaches deep into Denmark’s underworld, how will Henrik, Jensen, and her troubled teenage apprentice Gustav, escape the darkness that threatens to engulf them, in time to solve the mystery? What really happened to Lea? And where on earth is Matilde?