During an operation against an armed drug dealer, there is an exchange of gunfire and SEK officer Andreas Ziegler is fatally injured. Lena Odenthal and Mario Kopper take over the investigation and immediately search for the fugitive Florian Weigold. The colleagues of the SEC support the two commissioners in the best possible way. But Lena Odenthal recognizes that the SEK colleagues are also people with everyday worries and needs - and some of them would have had a good reason to kill Andreas Ziegler.