What is the solution to The Grimm Legacy?

In "The Grimm Legacy" by Polly Shulman, the solution centers around the protagonist, Elizabeth, and her friends uncovering the secrets of the magical objects housed in the New-York Circulating Material Repository. They work together to thwart a plot by a rogue group trying to exploit the power of these enchanted items. Through teamwork and clever problem-solving, they restore order and protect the magical legacy of the Brothers Grimm. Ultimately, Elizabeth learns about friendship, bravery, and the importance of standing up for what is right.