Mrs. Evelyn Henshaw is convinced that her husband is plotting her death and pleads with solicitor Rosa Epton to inform the police should anything happen. When the weighted body of a young man is dredged from the lake at the Henshaw's country home, Ralph Henshaw is called in for questioning. He begs Rosa to prepare his defence, but as the murder investigation proceeds, she finds herself ensnared by conflicting loyalties. Is her new clent the innocent victim of an elaborate trap or a ruthless, calculating killer?
