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 Lina a chance to clear his name: help Superintendent Saga Bauer track down the vicious killer terrorizing Stockholm before he strikes again. Only one man can stop him. 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….