Acclaimed writer and historian Deborah E. Lipstadt must battle for historical truth to prove the Holocaust actually occurred when David Irving, a renowned denier, sues her for libel.

'Denial' delves into historical truth, free speech, and Holocaust denial, emphasizing judicial justice and the power of truth. It raises questions about the limits of free speech and the spread of misinformation, drawing parallels to contemporary issues like "fake news." The film addresses emotional and ethical dilemmas, particularly excluding survivors' testimonies to prevent emotional manipulation. Its relevance is underscored by the ongoing struggle against bigotry and manipulated historical narratives.