Trolls sure know how to make trouble, but Treva is too smart and wily to fall for their tricks!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.