The National Assembly of Cree Peoples has gathered together in the Windy Lake First Nation, home to the Mighty Muskrats—cousins Chickadee, Atim, Otter, and Sam. But when the treaty bundle, the center of a four-day-long ceremony, is taken, the four mystery-solving cousins set out to catch those responsible and help protect Windy Lake's reputation! What's worse, prime suspect Pearl takes off to the city with her older brother and known troublemaker, Eddie. If they have the burgled bundle with them, the Mighty Muskrats fear it may be lost for good. With clues pointing in too many different directions, the cousins need to find and return the missing bundle before the assembly comes to an end. The history and knowledge passed down to each generation through the bundle is at stake.