The Grimm Legacy, by Polly Shulman

Charming and absorbing young fantasy, set in the special collections are of the New York Public Library. The magical objects mentioned in the Grimm fairy tales are kept in the Grimm Collection, but evildoers are out to steal them. Elizabeth Lew, a student in a nearby high school, is one of a handful of workers allowed access to the special collections. The exceedingly far-fetched plot is one of the reasons I think this was more of a children's book than YA, but Shulman's special brand of clean and delightful characters made this a great read. She is an author I often recommend to young readers who are reading above their age level, but aren't ready for some of the darker actual YA out there.