Here's what the prologue to the book states:
"Ye all knowest, my dearest readers, of the mounds that are doted across the land of this country, and ye all knowest of the legends pertaining to said mounds. Ye surely have asked thyself many questions concerning their construction. These very questions I, the author, was asking myself when I was searching around one of these mounds.
I eventually found an unusually flat rock, which I dug around with my hands the best that could be done under those poor conditions. A short time had passed until I realized that the rock I had been trying to dig up was no rock a ‘tall, but a stone box that appeared to be carved with primitive tools. I then pried it open using a rod and Lo, a set of plates with unusual Hebraic characters written on them. The plates themselves were about six inches wide by eight inches in length, and were about half an inch thick. They appeared to be made out of brass and were fastened together by three small rings that ran through each individual plate. The volume as a whole was about ten inches thick."
After this, Chapter 1 starts.