Following the fire disaster at the illegal party, Nellie sets off with Janosch in search of her missing brother and meets the taciturn Tyler, who lives in the catacombs. Even though she has no authority to investigate the tragedy, Magdalena starts her own investigations at the same time. Meanwhile, Lisa fears for her idealistic building project after the accident and tries to persuade her father not to give in. Nellie and Max's mother Anna, who is under pressure as a municipal building councillor, exploits the terrible events for her own purposes. (thetvdb.com)