The artist of a comic strip bases his latest story on an unsolved murder mystery where he claims he will provide the identity of the killer in the last cartoon. Before he inks the denouement, the cartoonist is murdered and Kane, who had urged him to abandon the project and provide his evidence to the police, feels obliged to solve both crimes.br br Private detective Martin Kane works in New York solving crimes. Depending on the year, Kane was either smooth and suave or hard bitten and the cooperation he received from the police depended on the year. The only constant was Happy McMann's tobacco shop where Kane hung out.br br Directed by Frank Burnsbr br Starringbr Walter Kinsella as Happy McMannbr Nicholas Saunders as Sgt. Ross br King Calder as Lt. Grey br William Gargan as Martin Kanebr Lloyd Nolan as Martin Kanebr Frank M. Thomas as Capt.