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Bill Brown tries to make his girl friend, Ann Wilson, jealous by flirting with Gracie Allen, the niece of his boss, at a company picnic. Quickly irritated by Gracie's relentless illogic, Bill nevertheless escorts her to the Diamond Slipper Cafe, where Gracie discovers Bill's cigarette case next to the body of escaped convict Benny "The Buzzard" Nelson. Gracie blithely incriminates Bill during the police investigation, and a worried Ann brings detective Philo Vance on to the case. During the course of the investigation, which is hampered by Gracie's maddening interference, Dixie Del Marr, a dancer at the Diamond Slipper, is murdered by poison placed on flowers that Vance had sent her. Quickly exonerated, Vance deduces that the killer is Daniel Mirche, the owner of the Diamond Slipper, who had framed the Buzzard for crimes committed by himself. Confronted by Vance and the police, Mirche implicates his lawyer, Richard Lawrence, in the murders and is about to shoot Vance when Gracie arrives, turning the tables on Mirche by providing evidence against Lawrence and preventing Vance from smoking a poisoned cigarette that he has been unknowingly carrying. The murders solved, Ann and Bill are reunited.