Claire Masterson was the girl at school that Maggie Owen always wanted to be. Confident, good-looking, she was the first to know the facts of life, the first to Sun-In her hair, the first, easily the first, to go all the way. And when Maggie bumps into her twenty years later, it is as if nothing has changed: Claire's life is one of career moves to New York and great sex with married men; Maggie's is one of bringing up her children and never seeing her partner Jake, whose ever-demanding job has become his 'other woman'. Or has it? Jake is consistently working late, working weekends, taking working trips abroad ...Maggie is suspicious, and when Claire talks a little too knowledgeably about Jake, she starts thinking the unthinkable. Her friends think she should confront them, but Maggie's got a better idea: she's going to have her cake and eat it.