On their 75th birthday, we meet Dora and Nora Chance, former dancers and illegitimate twin daughters of one of Britain's leading theatrical actors. They relate their colorful and amusing family history as the novel unfolds, describing their often strained relations with the legitimate branch of the family. Carter writes in a dry, comic, British style reminiscent of Fay Weldon. There is a good deal of theater chatter and a raucous Hollywood tour the girls undertake with father Melchior and his twin, Uncle Peregrine. Still, while there is much imaginative fun, the insider humor may be too parochial for American tastes. Libraries can probably skip this one.