Summary Weapons from war zones are rendered harmless in a factory that specializes in the dismantling and destruction of deadly substances. Aida Zaidan manages to abduct the lead chemist Dr. Hartmut Diestel of IBeCK and seize the last cartridge of sarin gas left from the Syrian war. Public prosecutor Anton Mehringer instructs Policewoman Sarah Kohr to find the cartridge and to free Dr. Diestel. It becomes clear to Sarah that Dr. Diestel himself is behind it. He lost his brother during his last mission abroad and wants to use the sarin gas to revenge on Wallhoffer-Chemie, who delivered sarin gas to Syria illegally. Wallhoffer-Chemie boss Jessika Wallhoffer gets nervous when their illegal arms trafficking becomes known. Their security officer Lutz Thiemann is sent to kill whoever knows too much and to destroy that missing sarin gas in case it would be taken as an evidence against them. After Jessika Wallhoffer's husband Erhard Wallhoffer finds out what she is doing, he tries to convince her to turn herself in, but she refuses. Thiemann kills him and disguises it as a guilty suicide so no blames will fall on her. He also kills Dr. Diestel, from whom Sarah is just able to take the sarin gas, but the timer is activated. The task force arrests Thiemann, and Sarah manages to bring the sarin gas back to IbeCK.

• Crime