Pursuit to Algiers

The King of Rovenia has been assassinated, and whoever killed him may not be finished. Sherlock Holmes (Basil Rathbone) and Doctor Watson (Nigel Bruce) are hired to take the dead king's son to Europe by way of Algiers, on an ocean liner full of passengers who each look like they might be part of the plot. Roy William Neill puts the two men in close quarters with the crew and a cabin of strangers, and Holmes lets Watson do most of the talking.