Frank and Emma investigate a mass grave that may have links to the Millennium Group.

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FRANK SEARCHES FOR ANSWERS WHEN AN ODD MAN REVEALS INTRICATE DETAILS ABOUT VICTIMS DISCOVERED IN A MASS GRAVE.

In Arlington, Virginia, a man named Ed sits on a park bench, quietly recording thoughts in a leather spine journal. As Ed looks up, he experiences visions of a human skull and skeletal hand. Meanwhile, in Fingus, Maine, construction site workers uncover a skeleton hand and a human skull buried beneath the dirt.

Watts arrives at the site, where he meets with Sheriff Walden. Walden suspects that the unidentified remains came from another area, as everyone living in his small county are accounted for. Shortly thereafter, Agents Baldwin and Hollis arrive at the scene. Baldwin is surprised to see Watts at the site. Watts explains that he and his team happened to be working another case nearby when he received a call regarding the discovery.

Back at Quantico, McClaren tells Frank that, fifteen years earlier, he received a strange letter after a woman named Cynthia Paggett disappeared. The note described in great detail how Paggett was murdered. But police never found a body. Over the course of the year, McClaren received five more letters, each describing the murder of another victim who vanished into thin air. The last two words of the author’s latest note read: “Fingus, Maine.”

Emma discovers a bullet hole in one of the skulls pulled from the construction site. She also discovers a ceramic plug covering another hole in the skull. Emma realizes that the victim had undergone surgery. She also realizes that such a procedure would be very uncommon, and hopes to identify the victim through the use of medical records.

In the first note McClaren received, the author pinpointed the exact location of Cynthia Paggett’s murder. Frank travels to that location, but the old address turns out to be a parking lot. Frank notices someone watching him from an apartment window nearby. When Frank enters the structure, Ed attempts to make a getaway. Frank orders the man to stop. Just as suddenly, Ed freezes, a crazy expression on his face. Later, Frank discovers a hidden door inside Ed’s apartment. The door leads to a library containing leather spine journals, each one bearing the name of a different victim.

Using computer technology, measurements taken from the skull are used to reconstruct the victim’s face. The image matches Paggett’s photograph. McClaren phones the site with word that a suspect has been taken into custody. He tells the agents that there are six victims in all. The agents believe that the case is reaching a conclusion.

Meanwhile, Frank finishes researching Ed’s journals-thirty-six in all. The spine of the final volume reads: “Cheryl Andrews, M.D.” Frank tells Ed that he once worked with Andrews, who disappeared the previous year. Ed, however, is very vague about what happened to her. McClaren interrupts the conversation when he drops by the apartment. Frank tells him that Ed witnessed the first murder from his apartment window. He then reveals that there are many bodies yet to be found each victim a successful professional.

Frank telephones Emma Hollis. He tells her that Peter Watts is at the dig to find Cheryl Andrews’ remains and keep their discovery a secret. He accuses the Millennium Group of killing Andrews. Armed with the new information, Emma unearths more bones.

Ed tells Frank that the lives of all of the victims were detailed in newspaper accounts. In the case of Cheryl Andrews, she had made a trip to Germany to report on a bizarre discovery she had made while performing an autopsy. But Andrews was arrested by customs officials. Records indicate she was deported, but Ed believes she was murdered. Emma phones Frank with information. She tells him that a “Homer B. Pettey” authorized Andrews’ release from a German prison. Later, Watts tells Emma that Andrews died in her home town of Omaha ten months earlier. Watts hands Emma a newspaper clipping of Andrews’ obituary. Emma travels to the town library in…