Waking up trapped inside the rocky, lumbering body of a mountain troll is the ultimate nightmare for an explorer who just wants to go home. Hilda has faced countless dangers before, but being transformed into the very creature her city fears most changes everything. Meanwhile, her frantic mother is left completely perplexed by the strange, magical changeling that has suddenly taken Hilda's place in their Trolberg apartment. This deluxe collector's edition binds together two of the most thrilling and emotional graphic novels in the beloved fantasy series. You will race against the clock alongside Hilda and her mother as they desperately try to find each other across the perilous divide between the human world and the Stone Forest. To make matters worse, the safety patrol is preparing to unleash a devastating new weapon that could wipe out the trolls forever, with Hilda caught right in the crossfire. You will be on the edge of your seat for every daring escape, magical twist, and heartwarming reunion in this beautifully illustrated adventure.