The Fundamentals of Tawheed

This book is a must read for anyone wishing to properly understand the religion of Islam.
The Fundamentals of Tawheed
clarifies in detail what Islam means when it says "ONE GOD" by identifying and explaining examples of the violation of the unique oneness of God within the cultures and beliefs of many cultures, the author proves Islam to be the only truly and purely monotheistic religion.

This is the first book written in English (not translated) on the essence of Islam, according to classical understanding.