There were no signature, no address, no date on the letter.
How strange! I didn't know what to think. I went to a park, sat down and thought about what to do. After an hour, I reached the decision that follows.
The two old gentlemen are playing a game that I don't understand. They are betting on me. (But, at that time, I didn't know anything about the details of the bet.)
If I go to the Bank of England to return the banknote, the bank will ask me lots of questions. If I tell the truth, no one will believe me. They will put me in an asylum. If I tell a lie, the police will put me in prison. I can't even give it to anyone, because no honest person will want it.
I can do only one thing: I must keep the bill for a whole month. And, I must not lose it. If I help the old man to win his bet, he will give me the job I want. The idea of an important job with a big salary made me happy. With this exciting idea in mind, I began walking down the streets of London.