Dower, Laura: They Came From Planet Q #4

Strange things are happening in the town of Riddle. All the silverware is missing! Fillings are falling out! The metal recycling machines are always empty! Could it have to do with the UFO Lindsey spotted through her camera lens? They must have come from Planet Q. But between the crafty Monster Squad and Lindsey's photography skills, those metal heads will surely be stopped.