There’s a face at the window.

A masked stranger stands in the shadow of a garden, watching his first victim through the window. He will kill him slowly – play him a nursery rhyme – make him pay. A killer in your house.

The police offer ex-Detective Joona Linna a chance to clear his name: help Superintendent Saga Bauer track down the vicious killer terrorising Stockholm, before he strikes again. Now Joona stands between a disturbed predator and its prey.

He must catch a killer who hunts in the shadows and who is dangerously close to losing control…