In "Hitler's War", Irving presents a narrative that deviates from the widely accepted historical account of World War II. He argues that Hitler was not directly involved in the planning and execution of the Holocaust, and that the atrocities committed during the war were the result of actions by lower-ranking officials and the SS. Irving also claims that Hitler was not aware of the full extent of the atrocities being committed.

Irving's work has been met with significant criticism and controversy, particularly regarding his views on the Holocaust. His books have been accused of promoting Holocaust denial and anti-Semitic sentiments. Many historians and scholars have challenged his interpretations, citing inaccuracies, flawed methodology, and a lack of credible sources.

Despite the controversy surrounding his work, Irving's books have had a significant impact on Holocaust denial and anti-Semitic discourse. His ideas have been influential among some far-right and neo-Nazi groups, which have used his work to promote their ideologies.