First there's Stuart, stolid, conventional, but not quite so dull as he pretends to be. Then there is Oliver, his glamorous, epigrammatic best friend. And veering wildly between them is Gillian, the cryptic beauty who marries Stuart and then astonishes everyone by falling in love with Oliver. These three are at once the protagonists and the hilariously unreliable "eye-witnesses" of the latest novel by the author of A History of the World in 10 1/2 Chapters, a funny, elegant, and affecting book that reimagines the romantic triangle as a weapon whosse edges cut like razor blades.