Rachel Singer is a former Mossad agent who tried to capture a notorious Nazi war criminal, the Surgeon of Birkenau, in a secret Israeli mission that ended with his death on the streets of East Berlin. Now, 30 years later, a man claiming to be the doctor has surfaced, and Rachel must return to Eastern Europe to uncover the truth. Overwhelmed by haunting memories of her younger self and her two fellow agents, the still-celebrated heroine must relive the trauma of those events and confront the debt she has incurred.