And now we take the book home--in the pneumatic tube, or aerial moving sidewalk, or airship, or whatever it is we take to get home. And now that we are home, let's read the book. It ought to be interesting. CHAPTER I _Tells of the Grantline Moon Expedition and of the Mysterious Martian Who Followed Us in the City Corridor_ One may write about oneself and still not be an egoist. Or so, at least, they tell me. My narrative went broadcast with a fair success. It was pantomimed and the public flashed me a reasonable approval. And so my disc publishers have suggested that I record it in more permanent form. I introduce myself, begging grace that I intrude upon your busy minutes, with my only excuse that perhaps I may amuse you. For what the commercial sellers of my pictured version were pleased to blare as my handsome face, I ask your indulgence. My feminine audience of the pantomimes was undoubtedly graciously pleased at my personality and physical aspect. That I am "tall as a Viking of old"--and "handsome as a young Norse God"--is very pretty talk in the selling of my product. But I deplore its intrusion into the personality of this, my recorded narrative. And so now, for preface, to all my audience I do give earnest assurance that Gregg Haljan is no conceited zebra, handsomely striped by nature, and proud of it. Not so. I am, I do beg you to believe, a very humble fellow, striving for your approval, hoping only to entertain you. My introduction: My name, Gregg Haljan. My age, twenty-five years. I was, at the time my narrative begins, Third Officer on the Space-Ship Planetara. Our line was newly established; in 2070, to be exact, following the modern improvements of the Martel Magnetic Levitation.[1] * * * * * Our ship, whose home port was Great-New York, carried mail and passenger traffic to and from both Venus and Mars. Of astronomical necessity, our flights were irregular. This spring, with the two other planets both close to the earth, we were making two complete round trips. We had just arrived in Great-New York, this May evening, from Grebhar, Venus Free State. With only five hours in port here, we were departing the same night at the zero hour for Ferrok-Shahn, capital of the Martian Union. We were no sooner at the landing stage than I found a code-flash summoning Dan Dean and me to Divisional Detective Headquarters. Dan "Snap" Dean was one of my closest friends. He was radio-helio operator of the Planetara. A small, wiry, red-headed chap, with a quick, ready laugh and a wit that made everyone like him. The summons to Detective-Colonel Halsey's office surprised us. Snap eyed me. "You haven't been opening any treasury vaults, have you, Gregg?" "He wants you, also," I retorted. He laughed. "Well, he can roar at me like a traffic switchman and my private life will remain my own."