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David Lefèvre, the Swamp Killer (20x4)

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In 2011, in the hortillonnages of Amiens, in the Hauts-de-France region, two corpses were found a few months apart. In January, the body of 22-year-old Julien Guérin was seen floating in the network of canals that irrigate the city. In September, the body of Alexandre Michaud, aged 24, was found. The two victims did not know each other. The first drowned, stunned by alcohol and drugs. The second was shot twice. In the course of their investigations, the investigators made a crucial discovery: the two men had spent the last hours of their lives with the same individual .