Children have been disappearing for years, and no one knew where they went. A little troll stole his love decades ago trapping her inside a mountain. Now, a young girl named Mattianna has disappeared and a peculiar frog brings his story of being changed to an animal to the royal family. Adventurers are needed to find the source of the animal transformations and missing girl, which leads them from the City of Grimsby into the Shadow Forest, and to the great Glass Mountain. 

This is the third book in the Kingdom of Grimsby series, which is inspired by stories told and collected by the Brothers Grimm and built in a 5E framework using the open gaming license. The adventure is ideal for 3-6 players, but could be balanced for more or less. The adventure takes about 40-55 hours to run. It includes 6 suggested characters using home-brewed subclasses, backgrounds, and backstories, as well as 15 new magical items and 7 new stat blocks.