A documentary film about occupational diseases shot in 1957 at the Francolor factory in Oissel. It takes the form of a scientific investigation to discover the origin of a mysterious illness that has infected a worker at the factory.

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Main Cast: Jean Burgot, Yves Peneau, Jean-Pierre Grenier

Directors: André Heinrich, Alain Resnais

Writer: Chris Marker

Editor: Anne Sarraute

Cinematographers: Sacha Vierny, Ghislain Cloquet

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