Isobel finds the body of a woman on a deserted beach. A woman that looks just like her. They have the same birthday and grew up in the same town. But they never met. At first, it seems like they led parallel lives. But when Isobel digs deeper, she finds a darker side to Veronica. Then a single revelation changes everything: Veronica had been looking for her. The connections between their two lives are more than coincidence. Isobel wants the truth, but the secret that binds them is more dangerous than she ever imagined.