When Fresno is hit with an unexpected outbreak of deadly scarlet fever, Andi Carter is scared. Her town friends are getting sick and school is closed until it passes. Far from the danger, at least Andi has her horse Taffy and plenty of work on the Circle C ranch to distract her. But is she really safe? First one ranch hand, then two, and then her brother Mitch fall ill. Mother is convinced that the only way to protect Andi from this terrible disease...