Windy Lake First Nation has long been shared with cottagers, but now everyones arguing over who really owns the land. When the Mighty Muskrats learn that a stolen surveyors pin could solve the conflict, the four cousins make it their mission to find it and prove that the land belongs to their people!

The Windy Lake First Nations lands have been shared with cottagers for fifty years, but no one can agree on where the reserve land ends. The only thing that can prove the boundary is a steel surveyors pin with the borders of the Windy Lake reserve etched into its head.

When the Mighty Muskrats hear that the pin was stolen years agoand that it is connected to their grandpas mysterious pastthey make it their mission to find the missing pin and prove that the land belongs to their people.But the mystery gets tense when Grandpa becomes a suspect. Cousins Sam, Otter, Atim, and Chickadee must find that pilfered pin!