The Mysterious Mansion (French: La Demeure Mystérieuse) is a mystery novel by Maurice Leblanc featuring Arsène Lupin published in French first as a serial in June–July 1928 and as a book by Pierre Lafitte in July 1929. A first English translation was published in New York by The Macaulay Co in 1930 as The Mélamare Mystery (translator unmentioned) and a second one (as The Mysterious Mansion) in 2014 by The Koch and Co Agency (translated by Jean Pierre Koch with Ellen Kapusniak).