There was no doubt about it.

They were both in the same peculiar hand-writing.
My mind worked eagerly.

I sought to trace the probable deductions from this striking fact, known only to myself.

The man who had threatened me was the commander of this "Terror"-- startling name, only too well justified! I asked myself if our search could not now be prosecuted under less vague conditions.

Could we not now start our men upon a trail which would lead definitely to success?
In short, what relation existed between the "Terror" and the Great Eyrie?
What connection was there between the phenomena of the Blueridge Mountains, arid the no less phenomenal performances of the fantastic machine?
I knew what my first step should be; and with the letter in my pocket, I hastened to police headquarters.