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After policeman Casey hears a gunshot outside of Steve Brewster's lavish house, he telephones the station and announces that a murder has been committed. While reporting the crime, Casey hears another shot and drops from sight. When Lieutenant Foster then rushes to the scene, another shot is fired by a wild-eyed man, and the officer disappears, apparently murdered. The police question Martha, the Brewster's befuddled housekeeper, then leave the scene, unaware that both Casey and Foster have fallen in the sewer system. The next morning, Steve Brewster and his friend, Wally Richards, wake up to discover that, after they had left the previous night's drunken party, they were involved in a car accident with Fay and Gus, married vaudevillians, now sleeping in Steve's guest room. Concerned about how his fiancée, Judy Nelson, and her father, Captain Hobart Nelson, who are flying in to meet Steve's eccentric, globe-trotting aunt Jane, will react to Fay and Gus, Steve pleads with the performers to move to another room. Fay, a fan dancer, fakes a sprained ankle, and while Steve carries her across the balcony, he is spotted by Judy and her father, who denounce him as a philanderer and storm away to a hotel. After Steve leaves to make up with Judy, Martha and Wally find Phillips, the butler, missing and Steve's gun and coat in the servant's bedroom. Dim-witted Aunt Jane then arrives and mistakes Fay and Gus, who have dressed up in the Nelsons' clothes, for Judy and the captain. Unable to correct Jane's error, Steve rushes back to the hotel to prevent Judy and her father from meeting Jane, and while he is away, newspaper reporter Marty Hicks sees Martha disposing of Phillip's clothes and contacts Dugan, a police detective. As the wild-eyed man watches from his hiding place, Jane shows Gus the jewel-studded bracelet that she is going to give Fay as an engagement present. Excited by the prospect of stealing the bracelet, Fay and Gus play up their roles, oblivious to the arrival of Dugan, who impersonates a butler in order to discover the identity of the killer. Wally and Steve then pay Gus to "throw a fit" at dinner and convince Jane that insanity runs in the Nelson family. After the real Judy and Captain Nelson arrive and meet their imposters, the wild-eyed man comes out of hiding and terrifies Judy. As Steve confesses his deception to his fiancée, the wild-eyed man, in reality Phillips, reveals himself and explains to Dugan and the others that he had been trying to kill the family's black cat when Casey heard Steve's gun firing. Casey and Foster, who have been wandering in the sewer system, then are rescued and apprehend Fay and Gus before they flee with Jane's bracelet. With all mysteries solved, Steve embraces an understanding Judy and lets the vaudevillians go free.