Since a solo plane crash killed her husband two years ago, Annabelle Murphy has found no solace in raising her two children. Just when she thinks the grief is behind her, she gets the news that the wreckage of the plane has finally been located -- and that her husband did not die alone. Suddenly Annabelle is forced to question everything she once held true. Sofie Milstead knows the woman who was on that plane. A dolphin researcher who has lived a quiet life, Sofie has never let anyone get too close. But when Annabelle shows up on Sofie's doorstep full of painful questions, both women must confront their intertwining pasts -- and find the courage they need to face the truth.