In this chillingly plausible standalone thriller, Mick Herron, the New York Times bestselling author of Slow Horses, proves he "never tells a suspense story in the expected way" (The New York Times Book Review). When a highly classified espionage operation breaks down, a prisoner escapes from a transport vehicle on the busy ring road outside Oxford. Now an armed and desperate man is on the loose. He has taken refuge in a preschool, where a collection of teachers, parents, and students were about to start their day. No one understands what Jaime Segura wants, and he refuses to speak to anyone but an MI6 spy named Ben Whistler, a coworker of Jaime's boyfriend, Milo, who has gone missing. Now, as law enforcement descends upon this quiet corner of Oxfordshire, Jaime holds the preschool hostage as his collateral, and one teacher, Louise Kennedy, finds herself in the terrifying position of protecting innocent children from the terrible decisions of the adults around them. As Louise steels her nerves and weighs her every decision, she also begins to put together the fragments of truth from the chaos around her--and no one is fiercer or more resourceful than a teacher on the trail of justice.