The Mighty Muskrats have a new case to solve: to find the whereabouts of their grandpa's long-lost sister. Once in the bright lights of the big city, the cousins get distracted, face off with bullies, meet some heroes and unlikely teachers, and experience many of the difficulties First Nations' kids can face in the city. The Muskrats' search for their missing auntie takes them all the way to the government, and reveals hard truths about their country's treatment of First Nations families.