Blood Ties

S9, E11: When the doctor's assistant Martina Wilms comes to the gynecologist's office in the morning, she finds a destroyed blood sample. Her boss, Dr. Anna Petrova, is nowhere to be found. Anna's boyfriend, surgeon Marc Schönberg, has to admit that he fought with her the night before because she was obsessively looking after her Bulgarian niece Daria and wanted to break up with him because of it. He claims to have nothing to do with her disappearance. Daria also pretends not to know anything, saying that she resolved any problems with Anna.