I went straight to the booking-office, and bought a first-class ticket, single, to Berlin. One never knows what may happen and I had several things to do before the train went.
The bookstall was just opening. I purchased a sovereign's worth of books and magazines, English, French and German, and crammed them into the bag I had procured at the café. Thus laden I adjourned to the station buffet.
There I set about executing a scheme I had evolved for leaving the document which Semlin had brought from England in a place of safety, whence it could be recovered without difficulty, should anything happen to me. I knew no one in Holland save Dicky, and I could not send him the document, for I did not trust the post. For the same reason I would not post the document home to my bank in England: besides, I knew one could not register letters until eight o'clock, by which hour I hoped to be well on my way into Germany.
No, my bag, conveniently weighted with books and deposited at the station cloak-room, should be my safe. The comparative security of station cloak-rooms as safe deposits has long been recognized by jewel thieves and the like and this means of leaving my document behind in safety seemed to me to be better than any other I could think of.
So I dived into my bag and from the piles of literature it contained picked up a book at random. It was a German brochure: Gott strafe England! by Prof. Dr. Hugo Bischoff, of the University of Göttingen. The irony of the thing appealed to my sense of humour. "So be it!" I said. "The worthy Professor's fulminations against my country shall have the honour of harbouring the document which is, apparently, of such value to his country!" And I tucked the little canvas case away inside the pages of the pamphlet, stuck the pamphlet deep down among the books and shut the bag.
Seeing its harmless appearance the cloak-room receipt—I calculated—would, unlike Semlin's document, attract no attention if, by any mischance, it fell into wrong hands en route. I therefore did not scruple to commit it to the post. Before taking my bag of books to the cloak-room I wrote two letters. Both were to Ashcroft—Ashcroft of the Foreign Office, who got me my passport and permit to come to Rotterdam. Herbert Ashcroft and I were old friends. I addressed the envelopes to his private house in London. The Postal Censor, I knew, keen though he always is after letters from neutral countries, would leave old Herbert's correspondence alone.
The first letter was brief. "Dear Herbert," I wrote, "would you mind looking after the enclosed until you hear from me again? Filthy weather here. Yours, D.O." This letter was destined to contain the cloak-room receipt. To conceal the importance of an enclosure, it is always a good dodge to send the covering letter under separate cover.
"Dear Herbert," I said in my second letter, "If you don't hear from me within two months of this date regarding the enclosure you will have already received, please send someone, or, preferably, go yourself and collect my luggage at the cloak-room of the Rotterdam Central Station. I know how busy you always are. Therefore you will understand my reasons for making this inordinate claim upon your time. Yours, D.O." And, by way of a clue, I added, inconsequently enough: "Gott strafe England!"
I chuckled inwardly at the thought of Herbert's face on receiving this preposterous demand that he should abandon his dusty desk in Downing Street and betake himself across the North Sea to fetch my luggage. But he'd go all right. I knew my Herbert, dull and dry and conventional, but a most faithful friend.
I called a porter at the entrance of the buffet and handing him Semlin's bag and overcoat, bade him find me a first-class carriage in the Berlin train when it arrived. I would meet him on the platform. Then, at the cloak-room opposite, I gave in my bag of books, put the receipt in the first letter and posted it in the letter-box within the station. I went out into the streets with the second letter and posted it in a letter-box let into the wall of a tobacconist's shop in a quiet street a few turnings away. By this arrangement I reckoned Herbert would get the letter with the receipt before the covering letter arrived.