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Sarah, her brother Billy, and her parents are moving into her deceased grandmother's house for the summer in order to fix it up and sell it, but this is a house of locked rooms and many dark and dangerous secrets.

Twins Theo and Alexander along with their sister Wil are abruptly dropped off at their Aunt Saffronia's house, where they learn they must complete a series of tasks in order to see their parents again, the first of which is solving a mystery at the Fathoms of Fear waterpark.