The four cousins from the Windy Lake First Nation are back for another mystery in Book Three of the Mighty Muskrats Mystery Series -- the first two books in the series are The Case of the Missing Auntie (Book Two) and The Case of Windy Lake (Book One). The National Assembly of Cree Peoples has gathered in the Windy Lake First Nation, home to the Mighty Muskrats: 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 must set out to catch those responsible and help protect Windy Lake's reputation!