Sammy Keyes and the Night of Skulls — Wendelin Van Draanen

In her newest adventure, junior high detective Sammy Keyes and her friends take a detour through a graveyard on Halloween night and find themselves in the middle of a mystery. Sammy must figure out how three missing people, two human skulls, and one ghoulish embalmer add up before she winds up six feet under herself!

And school presents its own set of tricks and treats. Sammy knows that a classmate is guilty of beating up a man on Halloween night. Should she obey the law and tell Officer Borsch? Or should she obey the junior high code and keep quiet?

Life and death and truth and justice have never been so tangled up...