Houghton Mifflin Harcourt, 2006
When a shipment of imported Italian muffins goes missing, Irving and Muktuk become the key suspects. Everyone knows their weakness for muffins and immediately think they are responsible! Irving and Muktuk realize that in order to clear their smirched names, they have to find the culprit themselves. They disguise themselves, sniff out some clues, interview possible witnesses, and try to find the thief. As with all good mysteries, the clues lead to a surprise ending.