" Bertram!” Jackaby patted him on the arm affably as he bustled past him into the front hall. “It’s been ages, how are the kids?” “I remain unmarried, Mr. Jackaby, and I’m afraid you can’t be seen just now.” “Nonsense. Miss Rook, can you see me?” “Certainly, sir.” “Well, there you have it. You must have your eyes checked, Bertram. Now "

― William Ritter , Ghostly Echoes (Jackaby, #3)