Those bewildering involvements for which my family had, I am afraid, a kind of unhappy genius,"" writes James Thurber. Unhappy, perhaps, for the Thurbers but great fun for the reader, and if you are a Thurber fan, the drawings help along the pleasing sense of bewilderment to an amazing degree. A nightmare autobiography, a lunatic fantasy, which is meat that will be relished by those who like their Thurber unadulterated. Many of the chapters have appeared in The New Yorker.