Over the past hundred years, dramatic social upheavals have taken place in the name of Karl Marx's theories. In Western Europe, the student movement of 1968 and the Eurocommunists were inspired. And in recent times, the thinker has experienced a renaissance.

Both a political narrative and a psychological reflection, this documentary explores the personal journey of a quarry worker’s son from Calvados who rose to become the last great figure of the French Communist Party. It delves into the logic that shaped his path and his lasting impact on France’s history.

On January 15, 1972, Leonid Pliouchtch, a Ukrainian mathematician who was unknown at the time, was locked up in a Soviet psychiatric institution and accused of dissidence. His wife, Tatiana, fought for his defense and contacted a committee of French mathematicians to help him. Led by Laurent Schwartz, they launched a three-year campaign to secure his release and succeeded in getting the USSR to back down on the issue.