This card,' and he lifted a square piece of grey pasteboard with a big stamp at the corner and some code words stencilled on it, 'will be your passport.

You will Show it to the man you seek.

Keep it jealously, and never use it save under orders or in the last necessity.

It is your badge as an accredited agent of the German Crown.' I took the card and the envelope and put them in my pocket-book.
'Where do I go after Egypt ?' I asked.
'That remains to be seen.

Probably you will go up the Blue Nile.