When Ethan Cross returns to the coastal town he once called home, he discovers a series of letters hidden inside an abandoned lighthouse. The letters seem to be written by a woman who vanished ten years ago. As Ethan follows the clues, he meets Lily Hart, a young artist carrying secrets of her own.
Together they uncover a story that connects the past and present, forcing them to confront grief, love, and the possibility that some promises never truly disappear.