Dereck tells the story of an American sociopath, who owns two personalities, one night and the other diurnal, who, wounded by the pains of his past, needs some alternative way of crying out his anguish. When he meets Alan, a retired violinist, and Anne, a sweet And strange girl, Dereck sees all the complexity of his mind being unraveled, and the mysteries are slowly being solved. The book has become a classic in Portuguese language, and for these brilliant words to reach more people, we present the English version of the book that enchanted Brazil.