This is an eschatological book, and it is quite innovative because it presents the biblical truths of the mankind future as if it had then happened within the "memories" of those who "experienced the story." 
Here's how a plot of how it is built: Hannah was sitting by the border of Percy Priest Lake in Tennessee, the USA, then abruptly became more and more transparent... 
Immediately she rose off of the ground and start to levitate upon the air... The celestial castles were extraordinary, and God's Castle filled the whole scenery, the name of the Antichrist was Daniel Cerxov Natahs, I played the maths by mind and in Roman numerals his name matches, D = 500, C = 100, G = 50, X = 10, 6 = VI = 666. Yet Natahs means Shatan overturned which is Satan in Hebrew... Shortly we would return to the earth.