Copenhagen in the 1890s. A pleasant city for those who experienced it at the time. This is the story of how Therese Schrøder came to live with Professor Jacobsen and became the children's nanny, which led to her meeting her sailor. This caused quite a stir in bourgeois circles at the time.

When Thomas´ sister dies in an accident, he discovers that her death may be connected to their deceased father´s work in military intelligence. As Thomas embarks on an investigation he soon finds himself and his family under surveillance by an unknown group of people.