this method could be used to transfer a specially marked up book for encoding messages between spies.
When you see a specific book title for a specific high price, offer a specific alternate high price to buy and it will be sold to you and you get the secret coding book.
The selling spy and buying spy then dont have to know each other or have any other contact.
When you see a specific book title for a specific high price, offer a specific alternate high price to buy and it will be sold to you and you get the secret coding book.
The selling spy and buying spy then dont have to know each other or have any other contact.