One night, a strange bat like creature bites Fluttershy, changing her body and giving her a thirst for blood. Once she recovers, she finds herself with new abilities and setbacks. How will she cope with these changes? How long can she hide her new abilities from her friends? Can she fight her insatiable need for blood?

Meanwhile, a strange pony from out of town comes to investigate a strange set of murders, where every victim appears to be drained of blood. Will he stumble upon Fluttershy's secret? And what secrets is he himself hiding?