该片讲述的是福尔摩斯和他的好朋友华生医生帮助一位王子夺回他应得的王位并护送他回国。而在回国途中的船上又出现了三个不速之客……
Basil Rathbone
Sherlock Holmes
Nigel Bruce
Doctor Watson
Marjorie Riordan
Sheila Woodbury
Rosalind Ivan
Agatha Dunham
Morton Lowry
Steward
Leslie Vincent
Nikolas Watson
Martin Kosleck
Mirko
Rex Evans
Gregor
John Abbott
Jodri
Gerald Hamer
Kingston
William 'Wee Willie' Davis
Gubek
Frederick Worlock
Prime Minister
Tom Dillon
Matthias Cherney (uncredited)
James Carlisle
Aide (uncredited)
