Big trouble in the big sky state!

Beth Farris and her brother, Reese, are camping with their parents in Montana's Glacier National Park. But when the pair set out together on a short hike, they find strange footprints in the earth . . . footprints far bigger than any normal creature could have made.
        What kind of animal could have made such enormous tracks?
        Beth and Reese follow the footprints into the mountains. When the ground suddenly begins to tremble, they begin to wonder if they'd done the right thing by following the tracks. Further, when they see an enormous, hideous beast emerge from the forest, they know they're in for a fight for their lives . . . and fight they must win to survive. But how can two ordinary kids from Montana defend themselves against such gigantic, mutated monsters?