Shrinking stalactites in the caverns, disappearing mortar lines in the county courthouse, and double-circle sink holes piercing the farmland; the Mad River Valley is falling apart, and the Mad River Magic gang is called into action. When the gang discovers that calcium is the common denominator and sees suspicious activity near a hidden cave along the river, they go underground. Watch as they navigate a skeletal series of dark slimy chambers. Scratch your head as they use a new law of physics. Sit on the edge of your seat as they battle an out-of-this-world invisible villain. Gasp as they discover the villain's bizarre enterprise that is consuming the calcium. And hold your breath as the gang attempts to destroy the villain, restore the calcium deficit, and save the foundation and bedrock of the Mad River Valley community.
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