Kansas City manicurist Rosie Sturgis is loved by Dynamite Carson, a small-time gangster. Marie Callahan, her fellow manicurist and roommate, urges Rosie to drop Dynamite and go after the three things a girl needs: "money, jack and dough." While Dynamite is in St. Louis, Rosie goes out with a rich customer, who happens to be Jimmy the Duke, a gangster on the lam, and he steals the diamond engagement ring Dynamite gave her. Fearing Dynamite's anger, Rosie and Marie head for New York and disguise themselves as Outdoor Girls of America to blend in with a troop traveling by train. In a New York taxi, Rosie and Marie meet two businessmen, Samuel Warren and Jim Cameron, and follow them on board a ship bound for Paris. Rosie and Marie finagle the men into paying for their passage and buying them new clothes. Dynamite, who has followed the women, hides in the stateroom of millionaire Junior Ashcraft, who has hired detective Marcel Duryea to investigate his actress wife, "Love-ums," who is having an affair in Paris with Russian Dr. Sascha Pilnakoff. When Rosie and Marie learn that a millionaire is on board, they pose as French manicurists and enter his room. Although Dynamite exposes them, they fall into hysterics, and Junior gives them a check to repay Cameron and Warren. In Paris, Duryea reports to Junior, and Rosie agrees to pose as Pilnakoff's lover to make Love-ums jealous. Duryea, who is allied with Love-ums to get a large divorce settlement, double-crosses Junior, however, and instead of his wife finding Pilnakoff with Rosie, she finds Junior with Marie. Junior decides to give up his wife in favor of Marie, and Rosie promises to return to Kansas City with Dynamite on the condition he go "straight."