The idea is simple, vain, exciting. Tap the app, upload a picture of yourself, find your lookalike. Set up a meeting to see whether you have anything else in common. When Ella and Jem meet, the physical resemblance is uncanny, but their lives couldn't be more different. One is from a tiny island in a deprived Northern community - pretty much the back of beyond - where she has no job, no boyfriend, limited prospects. The other is a London socialite, an aspiring actress living in a multimillion-pound mansion. By all appearances, she's living a charmed life, but she's got some serious shit to run away from. Both of them have. Can either hide in her double's skin? And at what cost? Will it solve any of the problems, or merely compound them? This is an all-too-believable, twisty, compelling story that will leave you reeling.