Hancock bumps his head and suffers from temporary amnesia. Whilst he is unable to remember who he is, Sid persuades Hancock that he is Prince Nicolai, the last heir to the Russian Royal Family's fortune... but there are others making the same claim.

Hancock dreams that he has a job as a night club pianist and he falls in love with a foreign baroness. But she is engaged and Hancock is challenged to a duel with her fiancé.