"Yes; I hadn't noticed that.

It begins very clearly and then breaks off.

I wonder why." Thirlwell said nothing.

It looked as if Strange had been interrupted; the shakiness of the last few lines hinted that they had been written in haste.

There was a space between the last and the bottom of the paper.
Perhaps Driscoll had joined him and he had distrusted the man, who might have come into the camp while he was writing.