In the scenic mountains of Yosemite there is fresh air, beautiful wildlife and of course...the Haunted Hiker. When Jane learns of the spook terrorizing the national park right before a school trip, she decides she needs some backup to make sure she and her classmates are safe. So Jane turns to the Scooby gang! Going undercover, the gang will have to act quickly to solve the mystery of the Haunted Hiker-because if the ghost doesn't ruin their field trip, the singing school troubadour just might.