Twilight gets a very unexpected visitor in her library - Trixie, complaining about something odd with her hat. Twilight discovers one of Trixie's spells may have been distorted, resulting in a very dangerous side-effect focused on the hat's contents. Can Trixie and Spike keep the library safe from what's trying to escape her headgear until Twilight finds a spell to stop it?

Cover image made from vectors by Triox404 and LunaBubble-Ede96