After coming across an old photo, Peter Force must revisit the history he has struggled to deny. The photo depicts him, a young frontier adventurer who arrived in New York in 1901, and a young girl: Cheri- Anne Toledo, a beautiful mathematical prodigy whose memories appear to come from another world. Upon their chance meeting Peter believes her to be crazy, but as they are drawn into a tangle of overlapping intrigues, he must reexamine her secret. Did she indeed stumble across the key to time travel?