It houses the "Deutsche Krimi-Archiv", a collection of ca. 26.000 books, crime and detective stories only, also a collection of rare Crime - games. The house is an old one, the furniture of the time of Sherlock Holmes, just right to sit and read, have a cup of tea in the Café Sherlock or buy some books in the bookshop "Lesezeichen". All this you find in the same house.