As identical twins, Sam and Julie outwardly seem like perfect mirror images - but in reality Julie the brilliant experimental psychologist and Sam the wildly emotional artist could not be more different. Unable to understand or sympathise with each other since childhood, an unbreachable chasm has opened up between them. But now they're about to become closer than they could ever have imagined. When Sam is found in the wreckage of her Paris flat in a deep coma, it seems that only Julie's cutting-edge memoryscape technique - a technique that will allow her to enter Sam's mind and share her memories - can save her. But exploring her twin's memories means coming face to face with secrets that could destroy them both.