Die Todesgrippe von Köln

Also known as Deadly Exposure

Virus alert in Cologne: a deadly influenza pathogen has been released. Shortly afterwards, Sonja Kessler finds her husband Reinhard, a virus researcher, dead in their apartment. Everything points to suicide, but an unusual trail leads her and her stepson Jan to an apartment rented by Reinhard. Reinhard was apparently secretly researching a deadly virus there.