Nikki Conway and Jessica Maxson are ten-year-old detectives. Well, detectives in training. Up until Nikki's vacation to Utah's Nine Mile Canyon where Jessica lives, the only mysteries the girls have solved have been "Who made this mess?" and "Where is the hair brush?" But all of that is about to change. Someone has threatened to bomb the museum Someone is trying to scare Jessica's family into leaving their ranch Someone is stealing the canyon's rock art The closer Nikki and Jessica come to unraveling the mystery, the more dangerous the situation becomes.