Praise is due to Allah, Who made the life of early Muslims pure and shining. Blessings and peace are for the man, whom Allah sent as a guide and messenger, for his progeny and companions and for all those who are his comrades and those who are pious.I have divided the book into five chapters and a conclusion: 1. Chapter One is about: Historical Books: Causes of their Inadequacies 2. Chapter Two deals with principles of: Countering Doubts in Historical Perspectives 3. Chapter three presents the principles of: Countering Doubts in the History of Companions and Family of Prophet 4. Chapter four lists down: The Most Significant and Reliable Books of Islamic History 5. Chapter five deals with the: Books that Distorted Islamic History 6. The Conclusion includes the summary of what has been said in the book. Allah is the sustainer of all support!