With dogged determination, an intrepid terrier is ever on the trail of a cunning criminal. This series of boisterous mysteries will engage and entertain those who follow Jack's lead, as he sniffs out the culprit every time. Someone is stealing the collars off the dogs in Doggeroo. Using his super-sniffer, Jack narrows it down to one suspect. With the help of the Jack-pack, a group of local dogs, Jack uncovers a dog collar scam affecting all of the neighboring towns.