Aquamarine. Poster of the 2006 movie and cover of the 2001 book
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Aquamarine
Alice Hoffman, 2001
movie vs book
Elizabeth Allen Rosenbaum, 2006

When two preteens stumble upon a lively mermaid named Aquamarine resting at the depths of their beach club’s pool, they quickly realize that their encounter exceeds their expectations. Aquamarine, who has ventured onto land in her pursuit of genuine affection, offers the youngsters an unexpected and enchanting experience.