Find out what they talk of; for how much each plays, especially if any of them play on parole: if you can read his private letters, of course you will; though about those which go to the post, you need not trouble yourself; we look at them there.

But never see him write a note without finding out to whom it goes, and by what channel or messenger.
He sleeps with the keys of his despatch-box on a string round his neck.
Twenty Frederics, if you get an impression of the keys.

You will, of course, go in plain clothes.

You had best brush the powder out of your hair, and tie it with a riband simply; your moustache you must of course shave off.
With these instructions, and a very small gratuity, the Captain left me.
When I again saw him, he was amused at the change in my appearance.
I had, not without a pang (for they were as black as jet, and curled elegantly), shaved off my moustaches; had removed the odious grease and flour, which I always abominated, out of my hair; had mounted a demure French grey coat, black satin breeches, and a maroon plush waistcoat, and a hat without a cockade.

I looked as meek and humble as any servant out of place could possibly appear; and I think not my own regiment, which was now at the review at Potsdam, would have known me.