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In this adventure, Ann, Mary, and Susan investigate a strange chirping sound. Once they start looking for it, it appears to be following them around! Is this mystery too much for the three detectives? What is this chirping noise and why is it following them around?

Meet Ann, Mary, and Susan, three girls who find new mysteries to solve every day! From missing chickens to chirping cows, their small riverfront farm is host to many unusual events and discoveries the girls must solve.