She's borrowed your life. But what if she decides to keep it?Glamorous Margot Jones is the fashion editor at glossy women's magazine Haute, and pregnant with her first child.Margot's used to her carefully curated life being the object of other women's envy - who wouldn't want her successful career, loving husband, beautiful house and stylish wardrobe?Maggie, a freelance journalist, certainly knows she doesn't measure up.So when Margot gets in touch to suggest she apply for her maternity cover at Haute, Maggie seizes the chance at living a better life - even if it's only temporary. But the simultaneous arrival of Margot's baby and a brutal end to her oldest friendship sends Margot into a spiral of suspicion and paranoia.Are Maggie's motives as innocent as they seem? And what happens at the end of the year when Margot wants her old life back - especially if Maggie decides she doesn't want to leave?