A headmistress is found strangled in her East London school, her death the result of a brutal and ritualistic act of violence. Found at the scene is a single piece of card, written upon which is an ancient Buddhist precept: I shall abstain from taking the ungiven. At first, DI Maya Rahman can’t help but hope this is a tragic but isolated murder. Then, the second body is found. Faced with a community steeped in secrets and prejudice, Maya must untangle the cryptic messages left at the crime scenes to solve the deadly riddle behind the murders – before the killer takes another victim.