Book 38 of the Mandie Books®. After a vacation with Senator Morton in Florida, Mandie and her friends return to her home in Franklin, North Carolina, to learn that a large crack has developed in the secret tunnel beneath her house. The house could be in danger of collapsing! As the crack widens, Mandie finds a mysterious cavern behind it. What secret to the hidden past does the cavern hold? What she finally discovers is so scary it gives Mandie nightmares! And then she remembers her favorite Scripture…More than six million Mandie Books® have been sold.