Indiana, a twelve-year-old raised in the city, moves to the quiet town of Otterville to live with her father. This rural town was once famous for its river otters, but they have all disappeared, leaving the town's residents downhearted. When Indiana sees two new otters playing in the river, it sparks hope in the entire community. But to protect them, she will have to team up with her new group of friends to confront a greedy tycoon, a corrupt mayor, and even her father, the town's sheriff.