Johanna Gabathuler, a Swiss nurse, returns from a Red Cross mission on the Western Front heavily pregnant. Back in Davos, where her family runs the Curhaus Cronwald, she gives birth. While she is still in the delivery room, her father secretly has the newborn taken away, believing it necessary to protect the family’s honor. For Johanna, the loss of her daughter sparks a painful struggle against both her family and her society.

Johanna is supposed to complete a spy mission at the New Year's ball; when the situation escalates, her family is in great danger.

Johanna discovers the meaning of Mission H; her sister becomes suspicious when she finds weapons and money in Johanna's room.

After General Taylor's sudden departure, Johanna takes precautions to avoid becoming worthless as an informer.

Dr. Mangold learns something from Johanna's fiancé that troubles him; Johanna is given a significant assignment.

An escape plan goes awry; Johanna is forced to use all her wits when she's caught in the crossfire of the battle for Lenin; Johanna's daughter is in danger.