these. You locked the code safely away at 10.20, you left the room two or three times, but each time the door, as well as the safe, was locked, and the keys in your pocket; and then, at 12.20, or two hours exactly after the code had been put safely away, you opened the safe again in presence of the Controller's secretary, and the code had vanished. That is the whole matter in brief, I take it?"
"Precisely." Mr. Telfer was pallid and bewildered. "It seems a total impossibility," he said; "a total, absolute, physical impossibility; but there it is."
"But as no such thing as a physical impossibility ever happens," Hewitt replied calmly, "we must look further. Now, are there any other ways into this room than by that door into the corridor? I see another door here. What is that?"
"That door has been locked for ages. The room on the other side is one like this, with a door in the corridor; it is used chiefly to store old documents of no great importance, and I believe that whole stacks of them, in bundles, are piled against the other side of that same door. We will send for the key and see, if you like."
The key was sent for, and the door from the corridor opened. As Telfer had led us to expect, the place was full of old papers in bundles and parcels, thick with ancient dust, and these things
