Burdened by the shame of a fresh secret she cannot share, Sara Jones is desperate to set back the clock. She reaches for past certainties, agreeing to consult on a series of ritual murders for London's Metropolitan Police. As Sara pieces together the perpetrator's heartbreaking motives, she sees how eerily alike the two of them are. Sara Jones grows ever-more certain she can catch this killer - but less-and-less sure that she wants to.