Karl G. Maeser first developed an interest in the Church through Moritz Busch’s Die Mormonen, one of the first anti-Mormon books published in German. More impressed by the teachings quoted in it than by the sarcastic commentary, Maeser wrote letter after letter to Latter-day Saint missionaries in Europe, requesting literature and baptism. Because preaching was illegal in his homeland of Saxony at that time, a missionary in England was finally called to study in Saxony and teach the schoolteacher and others in secret.
A. LeGrand Richards, “Moritz Busch’s Die Mormonen and the Conversion of Karl G. Maeser,” BYU Studies, vol. 45, no. 4 (2006), 47–68