This is not a new book, in fact it's pre 1934, but it is an amazing little work on prayer, written by "an Unknown Christian". I can't begin to tell you how dramatically it altered my prayer life, and of those I've shared it with. And I thought I had a good prayer life before....
It can be found on-line at:
http://www.ccel.org/u/unknown/kneeling/kneel.htmGracey