Alex Foster and Travis Sanders live in a small Southern Ohio farm town named Rivers Edge. Their first adventure takes them to the remote desert town of Sunshine, Arizona, where they find themselves in the middle of the Legend of the Apache Death Cave. The following summer, Alex and Travis have just graduated from high school and are headed to the small fishing town of Black Creek, Maine for a relaxing vacation before they both head off to college. Their trip becomes anything but relaxing, when they discover a mysterious creature in an underwater cave and a network of deadly gunrunners.