The Unusual Suspects (The Sisters Grimm, Book 2)

Orphaned sisters Sabrina and Daphne are sent to live with their mysterious grandmother. The girls start school, and Daphne is lucky to get Snow White for a teacher, but Sabrina is stuck with mean Mr Grumpner and a class of mildly psychotic sixth graders. When Mr Grumpner is murdered, the sisters must discover which Everafter is responsible.