After dropping a bit of a bombshell at a family dinner, old man "Kingery" (Eric Stanley) retires to his study where he is promptly shot. The door is locked. The windows are locked. Suicide seems the only answer for the coroner but not for his daughter "Gwen" (Anna Nagel) who is convinced of foul play. She summons ace private investigator "O'Leary" (Dick Purcell) and together with his wily sidekick "Sarah" (Ann Sheridan) they have to piece together just what happened and who did what to whom? As he becomes more embroiled, he realises that there are motives a-plenty amongst this man's family and ...