This pre-Code comedy-thriller centers on Robert Holden, a broke and discouraged veteran, who meets fellow American Elinor Green at a cafe in Paris. After their first encounter, Holden's attempt to return Green's thought-to-be stolen purse ends up rendering him a stowaway on board a ship bound for America. Also aboard is a collection of characters, including Green's banker fiancé, a famed scientist, and an opera singer. Romance begins to blossom between Holden and Green, just as a radiogram claims that an “infernal machine,” or bomb, is aboard the ship. Quickly each passenger accuses the others of planting the bomb until eventually Holden, jealous of Green's attention to her undeserving fiancé, falsely admits to being the culprit. In his role as assumed perpetrator, Holden tests the group further.

At a big party, Roger Fallon, now a woman-hater, right to the core - this all due to a failed marriage and disastrous love affairs - talks to Herbert Drake. Herbert who is happily married, bets Fallon that the next woman who walks into the room, whoever she is, won't let Fallon kiss her for 48 hours. Fallon takes the bet. Suddenly, a very beautiful and sexy woman walks in. It's Herbert's wife, Jeanne Drake...

Gabby Denton, a hard-drinking, down-on-his-luck drifter, seems to get a chance at redemption when his brother-in-law helps get him a job as a mechanic. Not realizing the garage he works for is actually a front for a stolen car ring, Gabby soon finds himself mixed up in both murder and a liaison with the boss's girl.

A salesman gets in trouble with a party girl and a debutante in Detroit.

A successful songwriter, dazzled by high society, falls for a society girl who is just playing around.

A wealthy family is thrown into turmoil when the daughter falls for the family chauffeur and the son begins to keep company with a chorus girl.

Sailor Spike dates girls whose names he finds in an address book. Each girl has the same tatoo, placed there by another sailor Bill. When Spike meets Bill they become friends. In Calais Spike meets Goldie. Bill warns him against her, but Spike ignores the warning until he finds Bill's tatoo on Goldie as well.

Thief Gaston Monescu and pickpocket Lily are partners in crime and love. Working for perfume company executive Mariette Colet, the two crooks decide to combine their criminal talents to rob their employer. Under the alias of Monsieur Laval, Gaston uses his position as Mariette's personal secretary to become closer to her. However, he takes things too far when he actually falls in love with Mariette, and has to choose between her and Lily.

A Tennessee art school student wins a scholarship to paint in Paris. He is thrilled until he arrives and discovers that his style is hopelessly passe and is considered trashy. The enterprising artist immediately changes style and begins painting highly-abstract moderns.

International con artist Martha Hicks a.k.a. Countess von Claudwig is released from another stay in prison and decides to treat her rheumatism with a stay at her estranged husband's hotel at a Wisconsin spa. There undercover, she checks in on the two daughters she abandoned as infants.

Troubles begin for the Sterlings when they buy an expensive car and friends start pressing them for rides.

When motorcycle cop Dick Fay gives a ticket to Phyllis Crawford, her father's graft-fed influence leads to his demotion to foot patrolman.