Treva's trouble with trolls begins when she climbs Mount Baldy with her dog Tuffi. The trolls who live there long for a dog, and they try to kidnap him. But Treva is brave and quick-thinking. She outwits one troll after another until she reaches the very top of the mountain, where five trolls are waiting--and they want her dog! From underground to mountain peak, Jan Brett's story is filled with adventure and eye-catching detail.