The Adventure of Sherlock Holmes' Smarter Brother is a 1975 Anglo-US comedy musical crime film. It features Gene Wilder, Marty Feldman, Madeline Kahn, Dom DeLuise, Roy Kinnear, Leo McKern, John Le Mesurier, and Douglas Wilmer. The younger brother of the consulting detective tries to steal Sherlock's glory by solving an important case assisted by an eccentric Scotland Yard detective and a lovely but suspicious actress.