DS Cassie Fitzgerald has a secret. In the 1990s when she was at school, she and her friends killed a fellow pupil. Thirty years later, Cassie is happily married and loves her job as a police officer. At her school reunion another ex-pupil is found dead. The trouble is, Cassie can't shake the feeling that one of her old friends has killed again. The gripping new thriller set in London from the author of the Dr Ruth Galloway Mysteries.