When he had gone Allerdyke reconsidered matters.

So Fullaway had been out the night before, had he--dining out, and at a theatre?
Then, of course, it would be quite midnight before he got in.

Therefore, presumably, he did not know that his secretary was about his rooms--and entering and leaving another suite close by.

No--Fullaway knew nothing--that seemed certain.
The remembrance of what he had seen sent Allerdyke, as soon as he had breakfasted, to the hall of the hotel, and to the register of guests.
There was no one at the register at that moment, and he turned the pages at his leisure until he came to what he wanted.

And there it was--in plain black and white-- NUMBER 53.MR.JOHN VAN KOON.