Theodor Eberbach's step-sister, Lise Hohenstein was thought to have been killed by the Stasi 3 years ago after she and her parents were captured by them during their failed attempt to defect to West Germany. A TSF pilot previously dispatched in Eastern Europe, she is assigned to the 666th TSF Squadron as reinforcement to make up for the injured Pham Thi Lan. She becomes under suspicion as a Stasi spy for her sudden appearance and assignment into Theodor's squadron. She announces herself as a Stasi agent during an ambush on the 666th Squadron and takes most of her former squad-mates prisoner for being affiliated with anti-Stasi activities. It is then revealed that after Lise was captured by the Stasi, she was brainwashed and conscripted to the Werewolf Battalion, serving under Beatrix Brehme. She and her squad falls victim to a joint-ambush effort by the 666th Squadron, the resistance organization Grosser Bar, and the Nationale Volksarmee. She is then killed by Theodor.