Grey, after a long harrowing life of overwhelmingly bright colors, ex-detective Pinkie Pie has come to truly appreciate grey in all it's muteness. She has also managed to surround herself with it, until her old boss Spitfire, head of the behavioral analysis branch of F.I.M, the 'Friendship Institute of Mysteries'. Pinkie really hoped she'd never get roped back, but when a mysterious murderous Pegasus begins to crash into the homes of ponyville, she finds she might not just have to go back, but confront and old foe as well.