Buenos Aires' Chief of Police, Coco Carlomagno, is sure his office high in the Obelisco is haunted. Every day at the same time he sees a floating pineapple and every day he hears a terrible noise. What could it mean? Who could it be? There's only one guinea pig Coco can turn to to help him in his hour of need: his logic-loving cousin Alberta. Can Alberta help him unravel the mysteries of the perplexing pineapple?