The Portorican prime minister asks British detective Sherlock Holmes to find a twin for King Fernando XXIII, a weak and frightened man who fears anarchists and does not want to show himself in public. Holmes finds in the Czech newspapers a photo of the perfect double, František Lelíček, a daring bon vivant drowned in debt, so when Holmes offers him money, Lelíček decides to travel to Portorico and play the role.
Vlasta Burian
as František Lelíček / Fernando XXIII
Martin Frič
as Sherlock Holmes
Lída Baarová
as The Queen / Her Doppelganger
Theodor Pištěk
as Prime Minister Count Mendoza
Eva Jansenová
as Conchita
Fred Bulín
as James, Holmes' Butler
Arnold Reimann
as Cafe Owner
Jára Beneš
as Composer
George Andreani
as Composer
Robert Ford
as Conspirator
Alois Dvorský
as Court Doctor
Josef Zora
as Court Doctor
