Louise Andersen lives a quiet life on the Norwegian island of Hidra with her partner, Joachim, where she runs a small café. One summer day, their peace is shattered when a stranger insists she is not Louise at all, but Helene Söderberg – a woman who vanished from Denmark three years earlier. She discovers not only that she is married, but also that she is the mother of a young boy. Driven to uncover the truth about her past, Louise leaves Joachim and the life she knows to seek out her family and discover what really happened on the night she disappeared. As she delves deeper into the mystery as Helene, she uncovers a shocking truth that turns her world upside down.