Mia and her partner Benny, along with Mia's sister, Alicia, will be in charge of solving some puzzling cases that are happening in their city Hamburg. Surrounded by ghosts and mysterious characters this group of friends, accompanied by other young people, follow their clues.

A historical series will now try to capture the atmosphere of this special place. A fictional story with a female main protagonist will be told in six episodes. Johanna is a nurse who gets embroiled in a plot involving international spies. She intends to find her illegitimate daughter and agrees to a dangerous deal with the German secret service. The story is set during World War I in the then supposedly neutral Switzerland.