British crime drama starring Griffith Jones, Ursula Howells and Honor Blackman. When the body of a wealthy woman, identified as Lucille Ainsworth (Howells), is discovered in Hampstead Heath it appears there are many possible motives and suspects for her murder and it's the job of Detective Inspector Marshall (Ewen Solon) to solve the mystery. Her husband, banker Robert Ainsworth (Jones), had suspected her of being unfaithful and had begun to follow her, placing him firmly in Marshall's sights and making him compelled to prove his innocence.