1917 — the First World War devastates Europe. In contrast, Switzerland appears to be an oasis of peace. But in reality, behind the scenes of neutral Switzerland, the agents of the world powers are at work. The war is getting closer and closer and also has an impact on Davos, where the elite of the opposing parties meet in the alpine health resort. The historical spy series Davos 1917 centers on Swiss nurse Johanna Gabathuler. After her Red Cross mission on the Western Front, she returns to her home in Davos pregnant, where her family runs the Curhaus Cronwald. It accommodates wealthy and influential guests from all over Europe as well as injured soldiers. While still in the delivery room, her father takes away her illegitimate child for the sake of honor. In the attempt to get her daughter Elli back, Johanna gets involved in a dangerous game and unexpectedly finds herself caught amongst the spies secretly operating in Davos, becoming the tip of the scales in a risky plan that will decide between war and peace.