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.