Following the assassination of the King of Ruthenia, Sherlock Holmes and Dr. Watson are tasked with a perilous mission: safely transporting the king’s son to Europe through Algiers. Their journey aboard a transatlantic ocean liner becomes fraught with tension, as they find themselves surrounded by a host of enigmatic passengers, each potentially linked to a sinister conspiracy aimed at eliminating the young heir. With danger lurking at every turn, Holmes must rely on his keen instincts to uncover the truth before it’s too late.