RACHEL'S HOLIDAY, Marian's classic novel about addiction, is being given a new lease of life with a fantastic new jacket treatment. Here's Rachel Walsh, 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 she finds herself being frogmarched to the Cloisters - Dublin's answer to the Betty Ford Clinic. She's outraged. Surely she's not thin enough to be an addict? Heartsick and Luke-sick, she seeks redemption in the shape of Chris, a Man with a Past. A man who might be more trouble than he's worth.