When a violent thunderstorm occurs, a large quantity of trash is deposited in the Capri Beach Club.

In the swimming pool, Hailey and Claire discover the spoiled yet beautiful creature that will change their lives: a mermaid named Aquamarine.

During the night, Aquamarine has undergone mild hardships; she has eaten very little, has been separated from her six sisters, and is suffering from the chlorine in the pool.

Claire and Hailey read books that contain information pertaining to marine life-forms, trying to find an answer to Aquamarine's troubling conditions.

In order to persuade Aquamarine to return to her home, Hailey and Claire arrange that she will spend one evening with Raymond, after which she must leave.

To compensate for her nudity and lack of legs, they plan to dress her in a long blue gown and place her in a wheelchair.

As she leaves, Aquamarine gives Raymond a seashell, by which to contact her by speaking her name into it; she will hear this call regardless of their relative positions.

Hailey and Claire carry Aquamarine to the ocean and cast her into the water, where she is restored to full health and strength.