There's a Grinch in Pomme Valley! Someone is stealing presents right from under the noses of unsuspecting home owners and leaving no trace of how he broke in. And, to make matters even more baffling, he's only stealing presents! Corgis Sherlock & Watson are on the case! Accompanied by their reluctant human, Zack, the unlikely trio must find out who's responsible for the thefts and stop him before anyone gets hurt. The townsfolk are scared. City officials are nervous. Can Zack and the dogs put a stop to this crime spree before Christmas is ruined for everyone?