In the late 1990s, American historian Deborah Lipstadt faces a significant legal battle when British writer David Irving sues her for libel. Lipstadt accused Irving of Holocaust denial in her book, igniting the lawsuit in a UK court where the burden of proof lies on the defendant. As Lipstadt and her legal team prepare for the trial, they delve into Irving's works and conduct meticulous research to substantiate their claims that he deliberately manipulated historical facts. The trial becomes a battleground for historical truth, raising questions about the interpretation of evidence and the principles of free speech.

The courtroom drama unfolds with high stakes, involving testimonies and expert analysis of historical documents. Lipstadt's lawyers aim to demonstrate Irving’s deliberate distortion of historical facts regarding the Holocaust. The tension mounts as both sides present their arguments, with Lipstadt's defense focusing on the broader implications of Holocaust denial and historical revisionism. The case evolves beyond a simple defamation suit, touching on critical issues of memory, accountability, and justice. The narrative underscores the importance of historical accuracy and the dangers of denying documented atrocities.