Book excerpt: Rachel Walsh is twenty-seven and the miserable owner of size 8 feet. She has regular congress with Luke Costello, a man who wears his leather trousers tight. And she's fond - some might say too fond - of recreational drugs. Until, that is, everything goes pear-shaped and she finds herself being frog-marched to the cloisters - Dublin's answer to the Betty Ford Clinic. She's outraged. Surely she's not thin enough to be an addict? Rachel isn't expecting plump, middle-aged men in brown jumpers, and more group therapy than you can shake a stick at. Heartsick and Lovesick, she seeks redemption in the shape of Chris. A man who might be more trouble than he's worth.