Join thirteen-year-old Gary Carter, his best friend, Coop, and his loyal canine sidekick, Russell, as they embark on an electrifying adventure on Mount Diablo, aka "Ghost Mountain." When Russell unearths a bone during their hike, it's the perfect chance for Gary to ace his biology assignment. Little do they know, this bone holds the key to an incredible mystery.

With the help of a local anthropology student, Gary and Coop discover that the bone belongs to a human. Fueled by ambition and a sense of justice, the amateur detectives set off on a heart-pounding mission to uncover the deceased's identity and bring closure to their family, dodging danger and finding jaw-dropping clues along the way. Get ready for a thrilling ride that will keep you on the edge of your seat until the very last page. Can Gary and Coop crack the case, or will the case crack them? Excitement awaits!