This man had been in Gresson's company, he knew German, he was obviously something very different from what he professed to be.

What if he were in the employ of our own Secret Service?
I had appeared out of the void at the Kyle, and I had made but a poor appearance as a bagman, showing no knowledge of my own trade.

I was in an area interdicted to the ordinary public; and he had good reason to keep an eye on my movements.

He was going south, and so was I; clearly we must somehow part company.
'We change at Muirtown, don't we ?' I asked.

'When does the train for the south leave ?' He consulted a pocket timetable.