Sherlock Holmes Solves the Sign of the FourMystery33Sherlock Holmes Solves the Sign of the Four33Mysterythumb_upthumb_downSherlock Holmes Solves the Sign of the FourFebruary 25, 1913An adaptation of the Arthur Conan Doyle novel starring Sherlock Holmes.US content warning Last Updated: 4 days ago Request Update CastHarry BenhamSherlock HolmesCharles GunnDr. WatsonMignon Anderson