The proprietress of a "Lodging House for Respectable Working Men," Arcanum has strict rules for her boarders. In particular, she banishes to the kitchen table anyone who arrives late for meals in the dining room. Protagonist William de Worde often has difficulty making it on time to the table. Mrs. Arcanum is progressive in also accepting clean and decent dwarfs and trolls as boarders. She serves more leftovers than original meals. As she dislikes foreign things, it is odd that she serves curries. The quality is low but the portions are large, which is what the tenants want.