An Unknown Book

You happen upon an old, worn leather book of nondescript value with no title or clue on the cover as to what lay inside. Before you can open the book, a letter falls out and onto the dry, cracked Earth beneath your feet. You bend down and pick it up. It is an old, yellowing letter and rips slightly when you unfold it. You do not know why, but you are guided by a higher power to read THE LETTER.