"I received a warning letter this morning.

There is a very important matter on foot here, Mr.Harrison, a matter so important that to bring it to a successful conclusion I fancy that those who are engaged in it would not hesitate to face any risk.

I have wired to England for help.

If anything happens that it comes too late, I want you, when you find that I have disappeared, even if my disappearance is only a temporary matter, to let them know in London--you know how--at once." The manager nodded.
"I will do so," he promised.

"I trust, however," he went on, "that you are exaggerating the danger.