Ian Laking is pathologically jealous of his beautiful wife, and obsessed with murder. His only hope lies in being treated by Dr. Morelle, the well-known psychiatrist and criminologist. Laking suspects his business associate, Duke Fenton, of being his wife's lover, and is plotting his revenge. Dr. Morelle and his secretary, Miss Frayle, become caught up in the ongoing drama of jealousy and revenge. When the plan fatally recoils upon Laking himself, will Dr. Morelle be able to unmask the murderer? Another spellbinding entry in this long-running British classic crime series