Warmth. urbane charm. Clever plotting. Slyly wicked sense of humor. All these words describe the novels and short stories of Patricia Moyes, who is, in the words of Encyclopedia of Mystery and Detection, one of mystery's "finest practitioners." Under the holiday tree, Who Killed Father Christmas? offers 21 mysterious gifts. Fans who recognize Moyes as the author "who put the who back into whodunit" will find parcels with traditional fairplay puzzlers. Thos who think that holidays are best taken with an ounce of cyanide will find presents filled with nefarious noels scattered everywhere, including "The Holly Wreath," a complete short detective novel. For those who suspect that English villages and exotic holidays are filled with larceny, Moyes has some brightly colored, and deceptively cheerful, surprise packages.