His and Her Summer tells the story of Ava and Daniel, two strangers drawn to the quiet town of Maple Bay, each carrying hidden grief. When Daniel discovers a long-lost box from Ava’s drowned grandfather, it awakens a decades-old mystery of love, betrayal, and death at sea. As ghosts from the past rise through fog and storm, Ava uncovers the forbidden affair that bound her grandfather to a woman named Marianne Daniel’s wife’s mother. When the sea finally reclaims its debts, both find peace in loss. The story ends with forgiveness, fulfilled promises, and the calm after grief’s tide.