1. Sell it for a billion dollars.
2. Hire the worlds #1 assassin for a measly 1 million dollars of that billion.
3. Assassin kills the new owner of the book and brings it back to you.
4.

5. Profit.
6. Move on to the next billionaire.
Of course many things could go wrong with my plan (i.e the assassin backstabs you while returning the book and uses it himself to kill you then take YOUR money).