Books: Francoise Goes to Hollywood

THE HEART-KEEPER by Françoise Sagan. 128 pages. Duffon. $3.95.

The heroine cannot decide what novçelist's nightmare she has stumbled upon. Confronting a homicidal maniac, she says: "I was drifting between James M. Cain and Kathleen Norris." Unfortunately, that is also the drift of Sagan's seventh novel, which is a little more weird than her usual blend of native wit and updated Colette. The characters and setting are American, but Dorothy Seymour, Hollywood scriptwriter, may as well be one of Sagan's Parisian cocottes: she wears St. Laurent copies, vacations on the Riviera, suffers liver attacks...