The Secret Passage

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While housesitting at the Funderburg home, Amy Jo and Becky discover a hidden door leading to a series of underground tunnels. Strange markings on the tunnel wall, visible only with a black light, lead them further and further into the passageways where the Pony investigators uncover a fiendish plot. Before they can escape the tunnel to warn the police, the girls are caught in a trap where there seems no possible way of escape.