Leila has never met Tess, but she now knows more about Tess than anyone in the world. She's read all of her emails, researched her past and asked Tess for every detail about her friends and family. Tess has never met Leila, yet if she wants to slip away from the world unnoticed, she needs to trust Leila with her life. At first, Leila finds it easy to assume Tess's identity. But as Leila soon discovers, there is much more to a person than the facts and there are things about life you can learn only by living it.