"The Light Between Oceans" is a novel by M.L. Stedman that tells the story of a lighthouse keeper named Tom Sherbourne and his wife, Isabel, who live on a remote island off the coast of Australia after World War I. Struggling with the loss of their own children, they discover a boat washed ashore containing a baby girl. They decide to raise her as their own, believing it to be a gift from the sea. As the years pass, the couple learns that the child's biological mother, Hannah, is still alive and grieving her loss. The story explores themes of love, guilt, and the moral dilemmas faced by the characters as they confront the consequences of their choices.