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Seven Keys to Baldpate is a lost 1925 American silent comedy mystery film based on the 1913 mystery novel by Earl Derr Biggers and 1913 play by George M. Cohan. Previously made in Australia in 1916 and by Paramount in 1917, this version was produced by, and starred, Douglas MacLean and was directed by Fred C. Newmeyer. Out of seven film adaptations of the story made between 1916 and 1983, this version is the only one that is now considered lost. The story was remade again later in 1929, 1935, 1946, and 1947. It was also remade in 1983 under the title House of the Long Shadows, featuring John Carradine, Peter Cushing, Vincent Price, and Christopher Lee.