Anna is a secret service agent. When she's not on a mission in London, Tripoli, or Tel Aviv, Anna likes to return to Amsterdam, to the secret annex where Anne Frank and her family hid, trying to escape discovery and capture by the Nazis. Strangely this is the only place in the world where Anna feels at home. During one such pilgrimage, the spy notices that someone is following her. After a harrowing chase, the "Organization" swiftly undertakes her exfiltration and takes her to a safe house, whose location is deliberately kept secret. There, she meets Celestino, the eccentric lover of literature who keeps a close watch over her and the eight other residents... who mysteriously begin to drop like flies. Will Anna be the next to go?