Lawrence Quirk's biography of actress Davis ( Fasten Your Seatbelts: The Passionate Life of Bette Davis, LJ 2/15/90) will probably stand as the definitive work. However, he never met her. Moseley not only met Davis, he was a confidante, and this memoir is based upon their 15-year friendship. Starstruck Englishman Moseley has made a point of not only meeting his favorites but also trying to become their friends. Davis eluded him even after Moseley became a credible figure in show business. Eventually they met, however, and their friendship lasted until a sad break late in Davis's life. Moseley's book complements Quirk's. A very personal tantly, it tempers B.D. Hyman's (Davis's daughter) My Mother's Keeper (Morrow, 1985); Moseley knew both of them and has his own version of events. A nice addition to the Davis literature.-- Rosellen Brewer, Monterey Cty. Free Libs., Seaside, Cal.