

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.
Sherlock Holmes

Doctor Watson

Sheila Woodbury

Agatha Dunham

Steward

Nikolas Watson

Mirko

Gregor

Jodri

Kingston

Gubek

Prime Minister

Matthias Cherney (uncredited)

Aide (uncredited)
Stimson (uncredited)

Steward (uncredited)
