It is probably one of the most important Christian books of the 20th century -at least in the top ten. It is one of those books that will change your perspective on everything. It is easy to read, but difficult to read at the same time. The prose are charming, but the messages cuts to the bone.
It doesn't have any eschatological emphasis, but deals with the need for true biblical revival within the world church. The original forward of the book is written by AW Tozer to give one a sense of the pedigree of this book. On the newer addition of the book there is an endorsement by Ravi Zacharias in which he says to the effect "No other book, besides the bible, has had a greater impact on my life and ministry."
The truth is, about 4 years ago, Ravenhill and his books were just about the only thing that people talked about on this forum. There was, at least at that time, a genuine longing for revival... since then any hope of revival seems to have been quashed by years of bickering over non-essential issues.
I need to go back and read this book again, I should check if they have it at the Wheaton College Library, I ended up giving away my copy.