In the wake of her father's death, Miranda Merchant sets out to uncover the truths about her family's ancestry on an isolated island off the coast of New England. She soon discovers that she shares an uncanny connection with the Seawalkers, mythical creatures that are said to roam the seas. As she delves deeper into her family's past, Miranda begins to question whether she is bound to the Seawalkers by more than just legend. With each step she takes towards the sea, she edges closer to a transformation that will change her life forever.

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Some movies that have similar genres and were produced around the same time as Sea Change include The Age of Adaline, Dune: Part One, Colossal, Lost River, The Lighthouse, The Secret Life of Walter Mitty.