While investigating why someone is trying to force people from their homes to expand a recreation center, Sammy is distracted by the lies she must tell to cover an accident she caused, but which was blamed on her nemesis, Heather.

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 involving missing people, human skulls, and a ghoulish embalmer, while school presents its own set of tricks and treats.