At the height of the Great Depression, Los Angeles oil mogul George Allan Hancock and his crew of Smithsonian scientists came upon a gruesome scene: two bodies, mummified by the searing heat, on the shore of a remote Galápagos island. For the past four years, Hancock and other American elites had traveled the South Seas to collect specimens for scientific research. On one trip to the Galápagos, Hancock was surprised to discover an equally exotic group of humans: European exiles who had fled political and economic unrest, hoping to create a utopian paradise. One was so devoted to a life of isolation that he’d had his teeth extracted and replaced with a set of steel dentures. As Hancock and his fellow American explorers would witness, paradise had turned into chaos.

When Kat Bird wakes up from a coma, she sees her mirror image: Jude, her twin sister. Jude’s face and name are the only memories Kat has from before her accident. As Kat tries to make sense of things, she believes Jude will provide all the answers to her most pressing questions: Who am I? Where am I? What actually happened? Amid this tragedy, Jude sees an irresistible opportunity: she can give her sister a brand-new past, one worlds away from the lives they actually led. She spins tales of an idyllic childhood, exotic travels and a bright future. But if everything was so perfect, who are the mysterious people following Kat? And what explains her uncontrollable flashes of violent anger, which begin to jeopardize a sweet new romance? Duped by the one person she trusted, Kat must try to untangle fact from fiction.