During a street raid, Mattes and Melanie arrest people carrying false ID, including pregnant Irina, which turns out to be a Czech alias for local Sandra Beyer, who is a fugitive for a lethal arson years, even her partner ignored that past. She runs, but needs medical care for an infection urgently. The team searches for her and the details of the fire in the anarchist group she belonged to with a present mission preacher, politician and working man, one of which is later badly beaten on the head.