Perry is paid a visit by a Dorrie Ambler who wants him to verify her identity. Shady private eye Phil Arthur has been paying her to frequent certain places around town and Dorrie thinks it's because she bears a strong resemblance to madcap heiress Minerva Minden. After some digging, Perry finds out that Minerva might have been involved in a hit-and-run accident and it appears as though Dorrie is being used to prove that.
Paulo Porro is a charming young man from Sicily with a clever scam for ingratiating himself with Italian-American families. But when he tries his charms on Enrico Bacio, Paulo runs into a problem. It seems as though there was bad blood between the Porro and Bacio clans back in Sicily. Bacio even believes that Paolo has come to kill him. When Bacio is later found with a file lodged in his neck, Paolo is blamed for the murder.
Mona Harvey is the principal stockholder in a publishing company run by her uncle, Everett, and the wife of an eccentric sculptor named Hannibal Harvey who is being blackmailed. Unable to get at any money due to Mona's absence, Hannibal has ditzy model Bonnie Dunbar write a blackmail note to Mona's uncle. Everett gets the money out of petty cash and sends it to Bonnie. In the meantime, Mona returns, finds Bonnie's blackmail note, and decides to pay the model a visit. So does Hannibal. Without seeing each other, husband and wife both discover Bonnie's dead body. Mona gets arrested for the murder but she fears that Hannibal might be the real killer.