Davos 1917

After a mission with the Red Cross on the Western Front, nurse Johanna Gabathuler returns to Davos pregnant. While she is still in the delivery room, her father takes her newborn daughter away from her. To get her back, she will have to make a deal with German secret services.

Johanna and Ilse discover the meaning of “Mission H”. The nurse must then prevent a mysterious Swiss Army encryption device from falling into the wrong hands, but her sister becomes suspicious when she finds weapons and money in her room.

While the hunt for the traitor responsible for the explosion begins, Johanna does everything to ensure the implementation of the "Lenin Plan", which involves a revolt against the Tsar in order to get Russia out of the war.