Elma and Harper are principled Halloween pranksters — cage-free eggs only, and always 2-ply toilet paper for the trees. If the neighbors did not want to be pranked, they should not have handed out raisins and dental floss. Then the Pumpking appears and takes every piece of candy they collected, including the rare full-size bars. Now armed with wit, the power of sugar, and several very sharp knives, these fourth-graders are going to get it back.