There is a wizard on the first map (near the Barracks) who stops you from entering his back room when I try to walk there. Cat-form, Shadows potions, Survivor Sneak all failed to work. Before I entered his shop I paid gold to listen to poem, and this distracted the wizard, but I did not use that time to run into his back room, as I did not know about it at the time. The poem performer is now gone (got exp for giving him money).
Am I stuck now, never able to loot this back room? There is a book of Elemental Hail and a magical orb in there I want to investigate...
