"The Adventure of Sherlock Holmes' Smarter Brother" is a comedic mystery film that follows the journey of Sigerson Holmes, the lesser-known brother of the famous detective Sherlock Holmes. When Sherlock is too busy to solve a case involving a stolen document, he passes it on to Sigerson, who must navigate a web of intrigue and deception to uncover the truth. Along the way, Sigerson encounters a cast of colorful characters, including a music hall singer, a Scotland Yard records clerk, and even the notorious criminal mastermind Professor Moriarty. As Sigerson works to solve the case, he must also confront his own feelings of inadequacy and prove himself as a capable detective in his own right. With plenty of twists and turns, this film is a hilarious and entertaining adventure that will keep you guessing until the very end.

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Some movies that have similar genres and were produced around the same time as The Adventure of Sherlock Holmes' Smarter Brother include The Return of the Pink Panther, The Cheap Detective, The Nude Bomb, Rough Cut, Revenge of the Pink Panther, The Cat.

The Adventure of Sherlock Holmes' Smarter Brother was released in theaters on December 14, 1975.