Lash is the head coal stoker on a steam ship whose shipmates have nicknamed "Captain". Lash somehow grabs the attention of society dame passenger Cora Nevins. Nevins is actually a jewel thief who's lifted diamonds from wealthy passenger Arthur Condrax. She needs Lash to aid in sneaking the "ice" ashore at Singapore. Cocky is Lash's concertina-playing buddy and uses it to signal Lash.

Tasia (Dolores del Río), a beautiful dancer lower class of Russia, falls heir to the throne Prince, Grand Duke Eugene (Charles Farrell), but only admired from a distance. At the outbreak of the Russian Revolution, the Duke falls in captivity and this allows Tasia be near him.