Theatre Key

Theatre Key is a quest item from Pathologic. It is obtained during the Bachelor's route on Day 4 for the main quest "Sanitary Procedures."

The Bachelor will attempt to examine the Theatre, but be unable to do so because the building is locked. An Executor near the entrance will tell him where to find the Tragedian who has the Theatre Key. The Bachelor must find and escort the Tragedian out of the indicated infected district in order to obtain the Theatre Key.

Quote
"Now the building can be inspected and appropriated for sanitary needs. The Theatre is the heart of the town. Its transformation into a hospital will be symbolic in a way. Instead of solemn Mask plays it shall now perform guignol."