THE BUTTERFLY (165 pp.)—James M. Cain—Knopf ($2).
James Cain's previous novels (The Postman Always Rings Twice, Double Indemnity, Mildred Pierce) gave readers more than a peek into the nature of sadism, masochism and homosexuality. His new novel, which he calls a "small morality tale," reads just like its predecessors, and claims to be about incest. In his introduction, Cain says: "I like it better than I usually like my work, and yet I have an impulse to account for it. ... The many fictions published about me recently bring me to the realization I...