Kollwein's Day of Truth

German district attorney Marie Hofmann and French police inspector Jean-Luc Laboetie are working on a case involving the murder of an employee at the nuclear plant Haut-Rhin, when an unknown man seizes control over the plant. David Kollwein, former head of security at Haut-Rhin, threatens to create a meltdown, should the French Minister of Energy fail to tell the inhabitants of bordering countries France, Germany and Switzerland the truth about the nuclear plant's ailing condition. While the whole region is being held captive in this situation, Marie uncovers a conspiracy reaching to the very top of French politics, one that shakes French nuclear policy to the very foundations.