A male corpse dragged out of Berlin's river Spree, mysteriously contains a female's DNA. She disappeared years ago after a wild nightclub party. He's identified as jeweler Serge Repin's son Igor, who received a life-saving bone marrow transplant from her, which exceptionally kept her DNA. But the operation was highly irregular, as turns out because the donor was blackmailing the patient's father. She ran away from her devout Catholic father Andreas Huber, who immigrated from the rich West. Meanwhile Mirko starts teaching his workaholic lover Katrin to respect their collaborators' normality, including Jannik's dream shaped in a culinary video blog.
—KGF Vissers