A. A. Milne,
The Red House Mystery
“ Gillingham, as I learnt when I took the liberty of listening to a conversation on the bowling-green between you and your friend Beverley. Where was I? Ah, you must have a look for that secret passage, Mr. Gillingham. “But what am I saying? Did I deceive you at all? You have found out the secret—that Robert was Mark—and that is all that matters. How have you found out? I shall never know now. Where did I go wrong? Perhaps you have been deceiving me all the time. Perhaps you knew about the keys, about the window, even about the secret passage. You are a clever man, Mr. Gillingham. ”
