Trou-Bull and Cha-Ox

Teddy is back at Summer's ranch, expecting to finally get some well deserved rest after solving mystery after mystery. So far, the looks are promising. Or so it seems. A group of bandits have suddenly captured the oxen on the ranch and replaced them with angry bulls. Even worse, they find out in the worst possible way that they have a week to solve this mystery. Will Summer and Teddy figure this out in time? Or will they go through trouble and chaos for nothing?