etired BAU profiler Max Ryan is on a book tour, his book on the Keystone Killer, an unsolved case on which he worked twenty years earlier. The Keystone Killer murdered seven women in Philadelphia over a two year period, he communicating with the media through clues to murder details hidden in word search puzzles. Eighteen years ago, the murders just stopped. Ryan believes the Keystone Killer is still loose and perhaps active. Ryan currently lives in Philadelphia, he who is still working on the case unofficially. While on a tour stop in Washington, D.C., one at which Gideon attends, the Keystone Killer is also there, he who leaves a message for Ryan including two drivers licenses, one of his last known victim, and the other of another woman named Carla Bromwell, who had since been found dead. Bromwell's death is atypical to the other seven in many ways, the BAU thinking that the Keystone Killer may be devolving as a killer. Ryan inserts himself into the case. The BAU welcome his knowledge on it, but find that he is less than a congenial colleague. But things become even more personal for Ryan as the Keystone Killer seems to be focusing his messages specifically to his old tracker.

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