DI Geraldine Steel is called to investigate the murder of a man who has been battered to death. His widow, Caroline, is terrorised into concealing the identity of the killer who then claims a second victim. This leaves Geraldine with a dark secret. The truth might help to solve the case, but it also threatens to cost Geraldine her career. When Caroline's 10-year-old son disappears, his distraught mother turns to the police, with fatal consequences.