Mix Cellini (which he pronounces with an ‘S’ rather than a ‘C’) is superstitious about the number 13. In musty old St. Blaise House, where he is the lodger, there are thirteen steps down to the landing below his rooms, which he keeps spick and span. His elderly landlady, Gwendolen Chawcer, was born in St. Blaise House, and lives her life almost exclusively through her library of books, so cannot see the decay and neglect around her.