In "The Impostor" (1977) a woman, Marina, recovers consciousness after a car crash to find herself in a psychiatric clinic. She recalls the accident clearly but she's told that all is her delusion. A man arrives, not her husband, but to get away she accepts the impostor. McCloy used in the story a cryptological double bluff. She had read about it in 1944 when she was writing "Panic", but because she was unable to trace the source, she improvised her own version of it.