Still PicturesThe final work of one of the greatest non fiction writers of the last century is a stunningly original memoir and a moving exploration of family history. For decades, Janet Malcolm's books and dispatches for the New Yorker and the New York Review of Books poked and prodded at reportorial and biographical convention, gesturing towards the artifice that underpins both public and private selves. In Still Pictures, she turns her gimlet eye on her own