When Cassie Fitzgerald was at school in the late ’90s, she and her friends killed a fellow student. Almost 20 years later, Cassie is a happily married mother who loves her job --- as a police officer. She closely guards the secret she has all but erased from her memory. One day, her husband finally persuades her to go to a school reunion. But then, shockingly, one of her old friends, Garfield Rice, is found dead in the school bathroom, supposedly from a drug overdose. Garfield was an eminent --- and controversial --- MP, and the investigation is high profile. The trouble is, Cassie can’t shake the feeling that one of them has killed again. Is Cassie right, or was Garfield murdered by one of his political cronies?