About to leave London for a much-needed holiday, Sherlock Holmes and Dr. Watson receive a cryptic invitation. Intrigued, Holmes accepts and is met by the prime minister of Rovenia [Rovinia], who begs him to escort Prince Nikolas home.
In preparation for their departure from London, the renowned detective Sherlock Holmes and his trusted companion Dr. Watson receive a mysterious summons. The prime minister of Rovinia [Rovinia] requests their help in escorting Prince Nikolas back to his homeland.