Books with title Adventures of the Sky Kids: Lost Treasure of Kolob Canyon

Josh and Trent are finally on the camping trip they have been dreaming about all year when they receive a visit from a mysterious old Indian. Because of their kindness, they are given the clues to an ancient hidden treasure. With the help of Josh's sister Jennifer and her friend Shasta, and all the luck they can muster, they use all of their skills as pilots and rock climbers to try and solve the mystery, in spite of the forces of nature that are conspiring against them, and a mysterious deadly Indian warrior that could be ghost or flesh. The clues to the treasure change their summer vacation into high adventure and extreme danger. Will they find the treasure before their luck runs out?