Nick and Laurie had thought they solved their giant problem when they drove all the giants into the sea. But now the Grace kids have come back to tell them they may have more trouble coming their way! It turns out the giants control Hydra, a dragon-like creature that is creating sinkholes all over Florida. Now with the mermaids refusing to return the giants to the shore, the nixies still missing, and the threat of a destroyed Florida drawing closer, the kids have to take matters into their own hads one more time...
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