Tanja Wilken starts her new job in Freiburg's homicide department and there's already a dead body on her very first day. What's more, everyone at the police station seems to be related to everyone else - it's a real bullpen.

It's summer and very hot in Germany's only open-air swimming pool for women. There, women bathe topless, in a bikini, bathing suit or burkini. Each follows different rules. This always leads to friction, which the overwhelmed lifeguard is not quite able to control. When a group of completely veiled women enthusiastically discovers the women's bath for themselves, rags literally fly: Who owns the bath and who makes the rules? Who owns the female body? And when is a woman a woman at all? The lifeguard resigns, exasperated. But when a man of all people is hired as the successor as lifeguard, the situation escalates in unpredictable directions.

Janne Flecker returns to her hometown of Cuxhaven because her brother Erik was found murdered in the mud. There, Janne's picture of her family is crumbling, known shipyard owners.