The true story of a German agent sent to the USA in 1944 in order to stop the development of the atomic bomb.

Lavish adaptation of Wilhelm Hauff′s fairy tale: Young charburner Peter Munk dreams of joining the upper class. He makes a deal with the sinister Holländer-Michel, who offers to trade Peter′s human heart for one made of stone. Once he has the "cold heart" in his body, Peter eventually strikes a fortune and enjoys great wealth, but at the same time, he becomes a bitter and emotionless man – and, having lost all traces of humanity, even murders his wife Lisbeth. Only then does Peter Munk finally realize what has become of him, and he decides to regain his real heart from Holländer-Michel.

Diederich Heßling is scared of everything and everyone. But as he grows up, he comes to realize that he has to offer his services to the powers-that-be if he wants to wield power himself. His life motto now runs: bow to those at the top and tread on those below. In this way, he always succeeds: as a student in a duel-fighting student fraternity and as a businessman in a paper factory. He cajoles the obese district administrative president Von Wulkow and wins his favor. He slanders his financial rivals and hatches a plot with the social democrats in the town council. On his honeymoon with his rich wife Guste, he finally finds a chance to do his beloved Kaiser a favor. And when a memorial to the Kaiser is unveiled in the town where Diederich lives and works, he delivers the address. He stands behind the lectern in the pouring rain, saluting his Kaiser. The crowd is dispersed. Everything is laid in ruins...