It's the summer of 1963 and J.J. Houston has stumbled upon the decomposed body of a young boy in the basement of a nearby abandoned house. When the body goes missing, J.J. realizes she may be next on the killer's list. Enlisting the help of her best friend, Bo, the two set out on a course of investigation that proves more harrowing at every turn. While exploring an amazing find at a local cave, they accidentally uncover an ever deeper scheme. Does the dead boy have anything to do with the discovery at the dig, or have J.J. and Bo uncovered an ancient secret its guardians will kill to protect?