Set in the late 1980s on an island off the coast of Maine, NEPTUNE follows the last summer of Hannah Newcombe’s childhood. Raised in a church by the island’s insular priest, Hannah has led a sheltered life. She plans on attending a prestigious boarding school on the mainland at the summer’s end, but the sudden disappearance of a classmate, swallowed by the sea, leads her to reexamine her ambitions. Hannah’s quiet obsession with the missing boy grows, leading to haunting dreams and visions. To pacify them, she vies to fill the missing boy’s role as a stern-man on his father’s lobsterboat. Now, torn between her commitment to the man who raised her and the man she hopes to save, Hannah is confronted with questions of her own identity for the first time.