One house. And the almost perfect murder ... Starling House is home to some of Britain's deadliest teenagers, still too young for prison. When the latest arrival is found brutally murdered, DCI Matilda Darke and her team investigate, and discover a prison manager falling apart and a sabotaged security system. Neither the staff nor the inmates can be trusted. The only person Matilda believes is innocent is facing prison for the rest of his life. With time running out, she must solve the unsolvable to save a young man from his fate, and find a murderer in a house full of killers.