Rainbow Dash gets pinned for murder. She's put on death row, but the ideal of death row is being upheld in Equestrian Court as the other elements of harmony fight night and day to save their friend. The idea was conjured up by Twilight because she knows how to fight Equestrian legal system and get changes implemented. In the mean time, Dash starts writing letters to Twilight and the rest of her friends, describing her day to day experiences.