A sleuth figure slips through the night, and all evidence points to a return of Mr. Pumpkin, the vigilante gourd representing Pumpkin Nation. Math and science seem to support the sudden flip-up in last week's podcast of the author's pumpkin pie at a local diner, but you can crunch the numbers yourself. Hostilities have been stirred again, and Mr. Pumpkin, one spicy character, wants a piece of the action.