The Perplexing Pineapple

Can Coco and Alberta solve the mystery? The first in a new chapter book series featuring two mystery solving guinea pigs.
 
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?