Crusading District Attorney Martin Ferguson, unable to penetrate the organized crime network because his witnesses are being murdered before they can testify, finally gets a break when he questions Teresa Davis, the roommate of latest victim Nina Lombardo. To his horror, Ferguson discovers that Murder, Inc., the gangland contract killers, disposed of the wrong roommate: It is Teresa who actually witnessed the murder by mob boss Albert Mendoza. And when the gangsters learn of the mistake, Teresa is next marked for disposal in this gripping drama of underworld intrigue.