After becoming involved in a killing, Kiddo gets on board Boyton's ship. When he learns what happened he dumps her on a South Sea island.

As a luxurious ocean liner makes its way across the Atlantic Ocean, the audience is made privy to the travails of several of its passengers. Edmund Lowe heads the cast as Monty Greer, a suave gambler who falls in love with Judy, the daughter of immigrant lens grinder Rudolph Kramer. In trying to recover some valuable securities stolen from banker Henry Graham, Greer finds himself in the middle of a fierce gun battle in the ship's engine room. Meanwhile, Graham, who has been cheating on his wife Kay with sexy dancer Sigrid Carline, is murdered by person or persons unknown.

Russian beauty Anita Mellikovna, traveling by train with a forged passport and carrying jewels, finds the police on her tail.

In Vienna, aspiring composer Johann Strauss Jr. clashes with his domineering father, who wants him to abandon music for a steady job in a bakery. Torn between his love for the baker’s daughter, Resi, and the encouragement of a wealthy countess, Strauss finds inspiration that leads to the creation of "The Blue Danube."

A young Russian girl is forced into a life of prostitution in Czarist Russia, and she and a British journalist find their lives endangered when she reveals to him information regarding the social crimes rampant in her country.