All you’ve got to do is to stay here till I come back. You’ll be a bit late, but nobody will complain, and you’ll have that quid for yourself.’

‘Right-o!’ he said cheerily. ‘I ain’t the man to spoil a bit of sport. ’Ere’s the rig, guv’nor.’

I stuck on his flat blue hat and his white overall, picked up the cans, banged my door, and went whistling downstairs. The porter at the foot told me to shut my jaw, which sounded as if my make-up was adequate.

At first I thought there was nobody in the street. Then I caught sight of a policeman a hundred yards down, and a loafer shuffling past on the other side. Some impulse made me raise my eyes to the house opposite, and there at a first-floor window was a face. As the loafer passed he looked up, and I fancied a signal was exchanged.

I crossed the street, whistling gaily and imitating the jaunty swing of the milkman. Then I took the first side street, and went up a left-hand turning which led past a bit of vacant ground. There was no one in the little street, so I dropped the milk-cans inside the hoarding and sent the cap and overall after them. I had only just put on my cloth cap when a postman came round the corner. I gave him good morning and he answered me unsuspiciously. At the moment the clock of a neighbouring church struck the hour of seven.

There was not a second to spare. As soon as I got to Euston Road I took to my heels and ran. The clock at Euston Station showed five minutes past the hour. At St Pancras I had no time to take a ticket, let alone that I had not settled upon my destination. A porter told me the platform, and as I entered it I saw the train already in motion. Two station officials blocked the way, but I dodged them and clambered into the last carriage.

Three minutes later, as we were roaring through the northern tunnels, an irate guard interviewed me. He wrote out for me a ticket to Newton-Stewart, a name which had suddenly come back to my memory, and he conducted me from the first-class compartment where I had ensconced myself to a third-class smoker, occupied by a sailor and a stout woman with a child. He went off grumbling, and as I mopped my brow I observed to my companions in my broadest Scots that it was a sore job catching trains. I had already entered upon my part.

‘The impidence o’ that gyaird!’ said the lady bitterly. ‘He needit a Scotch tongue to pit him in his place. He was complainin’ o’ this wean no haein’ a ticket and her no fower till August twalmonth, and he was objectin’ to this gentleman spittin’.’

The sailor morosely agreed, and I started my new life in an atmosphere of protest against authority. I reminded myself that a week ago I had been finding the world dull.

CHAPTER 3

The Adventure of the Literary Innkeeper

I had a solemn time travelling north that day. It was fine May weather, with the hawthorn flowering on every hedge, and I asked myself why, when I was still a free man, I had stayed on in London and not got the good of this heavenly country. I didn’t dare face the restaurant car, but I got a luncheon-basket at Leeds and shared it with the fat woman. Also I got the morning’s papers, with news about starters for the Derby and the beginning of the cricket season, and some paragraphs about how Balkan affairs were settling down and a British squadron was going to Kiel.

When I had done with them I got out Scudder’s little black pocket-book and studied it. It was pretty well filled with jottings, chiefly figures, though now and then a name was printed in. For example, I found the words ‘Hofgaard’, ‘Luneville’, and ‘Avocado’ pretty often, and especially the word ‘Pavia’.

Now I was certain that Scudder never did anything without a reason, and I was pretty sure that there was a cypher in all this. That is a subject which has always interested me, and I did a bit at it myself once as intelligence officer at Delagoa Bay during the Boer War. I have a head for things like chess and puzzles, and I used to reckon myself pretty good at finding out cyphers. This one looked like the numerical kind where sets of figures correspond to the letters of the alphabet, but any fairly shrewd man can find the clue to that sort after an hour or two’s work, and I didn’t think Scudder would have been content with anything so easy. So I fastened on the printed words, for you can make a pretty good numerical cypher if you have a key word which gives you the sequence of the letters.

I tried for hours, but none of the words answered.