After the King of Rovenia has been assassinated, Holmes and Watson are engaged to escort his son to Europe via Algiers, aboard a transatlantic ocean liner which also carries a number of suspicious persons, any of whom may be involved in a plot to also assassinate him.
as Sherlock Holmes
as Doctor Watson
as Sheila Woodbury
as Agatha Dunham
as Steward
as Nikolas Watson
as Mirko
as Gregor
as Jodri
as Kingston
as Gubek
as Prime Minister
as Matthias Cherney (uncredited)
as Aide (uncredited)
as Stimson (uncredited)
as Steward (uncredited)
