"What did I know about life, a wee heifer like me, a twenty-two-year-old no-mates stay-at-home from the rump end of Cumbernauld? What did I even know about sex, never mind drugs, or violence, or murder?"

Alison, a naive Scottish girl, moves to Barcelona and meets Chloe, a foxy American heiress. Chloe, as well as introducing Alison to a multitude of sins, teaches her new friend about the sweet taste of revenge. They soon embark on a sex-and-drugs romp through the gothic streets of Barcelona, while composing vengeful postcards home.
'Dear Lisa and Lauren, Enjoying sangria on La Rambla. Don't know if you'd like it here. The hot weather would be a nightmare for your athlete's foot and intimate itching - think of the thigh chafing! Nasty. Hasta la vista, Alison xxx'

But Alison quickly realises that there is a high price to pay for their decadent lifestyle as she finds herself caught up in a world of cruelty, deceit and murder -