伪造者弗里茨·诺贝尔伪造了希特勒从未存在过的日记。在身上，他找到了一个愿意购买的人，在德国杂志工作的赫尔曼·威利。两者都获得了巨额利润，然后骗局就炸了。这个故事讲述了80年代中期发生在德国的一个真实事件。

Schtonk! is a farce of the actual events of 1983, when Germany's Stern magazine published, with great fanfare, 60 volumes of the alleged diaries of Adolf Hitler – which two weeks later turned out to be entirely fake. Fritz Knobel (based on real-life forger Konrad Kujau) supports himself by faking and selling Nazi memorabilia. When Knobel writes and sells a volume of Hitler's (nonexistent) diaries, he thinks it's just another job. When sleazy journalist Hermann Willié learns of the diaries, however, he quickly realizes their potential value... and Knobel is quickly in over his head. As the pressure builds and Knobel is forced to deliver more and more volumes of the fake diaries, he finds himself acting increasingly like the man whose life he is rewriting. The film is a romping and hilarious satire, poking fun not only at the events and characters involved in the hoax (who are only thinly disguised in the film), but at the discomfort Germany has with its difficult past.

Fritz est spécialisé dans la falsification de portraits d'Eva Braun, la maîtresse d'Hitler. Il rencontre Hermann et lui parle de certaines choses ayant trait au régime nazi. Hermann qui travaille pour un grand magazine allemand paie pour toutes les informations qu'il peut obtenir, ce qui pousse Fritz à écrire l'histoire et le quotidien d'Hitler.

Die Geschichte der angeblich echten Tagebücher von Adolf Hitler. Der Fälscher Fritz Knobel fälscht Tagebücher Hitlers, die nie existiert haben. In dem schmierigen Journalisten Hermann Willié findet er einen willigen Abnehmer. Beide fahren riesige Gewinne ein, dann fliegt der Schwindel auf. Die Geschichte basiert auf dem realen Fall der Hitlertagebücher im Stern, der sich 1983 ereignete.