There's a sinister sound at the beach! Zoey can't wait to spend the summer at Pebble Beach with her dog Skippy and her cousins Sam and Morgan. But something is wrong this summer. A mysterious rumble in the water is harming the turtles, and there are boxes marked DANGER in the secret cave. The kids rush to figure out what's really going on this summer, and who is behind the sinister sound at Pebble Beach.

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