Sir Anthony Blunt, art historian to the Queen, confessed to having been a Soviet agent in the 1930s along with Guy Burgess and company (see An Englishman Abroad, below), now finds himself pressed to name a fifth spy on pain of being publicly unmasked. He remains a still life on the subject. At the same time, Blunt (a marvelous piece of work by James Fox) is intrigued by a supposed Titian portrait in the royal collection that, as layers are dissolved, reveals another, mysterious profile. In counter-espionage as in art, all is a question of attribution; gone are the days when "we could just take the odd fingernail," but there is always another layer that can be removed. Bennett's dialogue is a mystery of meaning and attribution; all is dissembling, everything a double entendre. (Prunella Scales's HMQ betters the real thing, we are quite sure; forgeries intrigue her, too.) A Question of Attribution is Bennett's most deliciously satisfying film, though just desserts are not to be had.