Cassandra Edwards is a graduate student at Berkeley: gay, brilliant, nerve-wracked, miserable. At the beginning of this novel, she drives back to her family ranch in the foothills of the Sierras to attend the wedding of her identical twin, Judith, to a nice young doctor from Connecticut. Cassandra, however, is hell-bent on sabotaging the wedding.   Dorothy Baker's entrancing tragicomic novella follows an unpredictable course of events in which her heroine appears variously as conniving, self-aware, pitiful, frenzied, absurd, and heartbroken—at once utterly impossible and tremendously sympathetic. Cassandra reckons with her complicated feelings about the sister who she feels owes it to her to be her alter ego; with her father, a brandy-soaked retired professor of philosophy; and with the ghost of her dead mother, as she struggles to come to terms with the only life she has.   First published in 1962, Cassandra at the Wedding is a book of enduring freshness, insight, and verve. Like the fiction of Jeffrey Eugenides and Jhumpa Lahiri, it is the work of a master stylist with a profound understanding of the complexities of the heart and mind.