Give it to me," came the answer.
Before he finished his wireless talk, Fred felt that the Russian operator did not fully trust him.

Nor did he blame him.

He knew the excellence of the German spy system; he had heard a good deal about it from Boris, and, for that matter, before he had even seen Boris at all.
So he only laughed, though he hoped that this feeling would not prevent the Russians from using the information he had given.

He could not see just how it was to be useful to them, however.

Possibly the fact that von Hindenburg was here, and not to the south, was the important thing.
By this time it was growing dark, and Fred decided that it would soon be safe to try to throw the cord up to Boris's window--as safe, at least, as it would ever be.