Dear Murderer is a 1947 British film noir crime, drama, thriller, directed by Arthur Crabtree for Gainsborough Pictures, and starring Eric Portman and Greta Gynt. The film has come to be regarded as one of the best movies made under the supervision of Sydney Box at Gainsborough. Plot Lee and Vivien Warren are trapped in a nightmare marriage. Vivien is despising, devious and habitually unfaithful while Lee is pathologically jealous. On his return from a lengthy business trip to New York, suspicious after his wife failed to write to him or call, Lee finds several cards addressed to Vivien signed "Love Always" and determines to kill her latest lover, Richard Fenton. He confronts Fenton, who admits to his affair with Vivien, and persuades him to end the relationship by writing her a farewell letter. He then kills Fenton, and stages the scene to look like a suicide, believing he has committed the perfect crime as the letter which Fenton had just written at his dictation has all the appearance of a suicide note. His scheme goes awry when he discovers immediately after the fact that Vivien and Fenton had in fact broken up some time before, and Fenton had been humouring him by writing the note. He is guilt-stricken at having killed Fenton needlessly, and realises that any suggestion of suicide on Fenton's part in despair over Vivien will now seem absurd to the police. When he discovers that Vivien now has a new beau, Jimmy Martin, he takes the opportunity to frame Martin for the crime, reasoning that this will serve the dual purpose of shifting suspicion away from himself while at the same time getting Vivien's current lover out of the way. While he arranges matters so that all the evidence points to Martin, the policeman in charge of the case, Inspector Pembury, has his doubts about the case but is unable to catch Lee out. Vivien begs her husband to intercede on Martin's behalf, promising to remain faithful in the future if he can devise a way to save Martin from the gallows without incriminating himself. Lee changes his testimony to the police to say that Fenton had died of suicide but that he had later manipulated the crime scene to look like he was murdered by Martin. Vivien convinces Lee to write a letter unbeknownst to him is intended to act as a suicide note. She