Krissie Donald has no desire to 'settle down'. Committed men are hers for the taking, but she prefers explosive liaisons to any sort of full-blown relationship. Krissie's best friend, Sarah, couldn't be more different. Married to a good-catch-doctor in her early twenties, it isn't long before Sarah's dying to start a family. Krissie and Sarah's relationship starts to go awry when Krissie becomes pregnant after a holiday dalliance in Tenerife. For Sarah, who's been trying to conceive for what seems like forever, Krissie's pregnancy can't help but seem a little unfair. Things between Krissie and Sarah go from bad to worse during a holiday in the Scottish Highlands with Sarah's husband, Kyle. What starts out as an enjoyable and much-needed break soon becomes a nightmarish combination of sexual tension, murder and mayhem.