"Twelve-year-old Tegan and his friends are excited to set out on a weeklong backpacking trip through the wilderness in Shadow Canyon, known for its vast forests and jaw-droppingly deep canyon. But after the group sets off on a little-used trail to visit a remote waterfall, they soon discover that the path markers they've been following have mysteriously disappeared, leaving them hopelessly lost. As Tegan and his friends try to find their way back...