The Visitor
by Lee Child
The prologue opens with a mystery person's point of view on knowledge, power and killing, "People say that knowledge is power. The more knowledge, the more power. Suppose you knew the winning numbers for the lottery? You would run to the store. And you would win. Same for the stock market. You're not talking about a trend or a percentage game or a whisper or a tip. You're talking about knowledge. Real, hard knowledge. You would buy. Then later you'd sell, and you'd be rich. Any kind of sports at all, if you could predict the future, you'd be home and dry. Same for anything. Same for killing people."
In New York City, Reacher confronts and beats up two thugs sent to collect protection racket money from the new restaurant in which he has just finished dinners, and deliberately implies to the thugs that he is a member of a rival crime organisation. Reacher is picked up by the FBI and questioned but explains he's been a loner since he mustered out of the army. He is then questioned about two women whose cases of sexual harassment he dealt with when he was an MP. It is revealed they have both been killed in the last few months and a criminal profiling team has come to the conclusion that the person responsible was someone exactly like Reacher. Reacher realizes that he has no alibi for the places and times that the women were killed, and he requests a lawyer.
Reacher's lawyer girlfriend Jodie arrives, and he is released after further questioning. Jodie returns to work, and Reacher drives to his house in upstate New York that he inherited from Leon Garber. He is soon called upon by two members of the FBI team that previously questioned him. A third woman has been killed who was also an ex-soldier who filed for sexual harassment – albeit in a different timeframe from the first two. The FBI compels him to assist with the investigation by threatening to hurt him and, possibly, Jodie too.
Reacher and Special Agent Lamarr, the lead profiler on the team, drive from New York to the FBI Academy in Quantico, Virginia, whilst discussing information on the case. Lamarr's stepsister, it so happens, is a woman with the same particulars as the three already killed. Lamarr also reveals the killer's M.O., which is killing the victims in an unknown way, with no bruises or injuries, leaving them naked in their bathtub, filled with army-issue camouflage paint.
The team continues the search, and the next victim is Agent Lamarr's stepsister. Local policemen are then put on surveillance of the remaining women on the list. Eventually Reacher and Harper catch the killer. It is none other than FBI Agent Lamarr. She is in the process of killing her fifth victim when Jack intervenes. Reacher and Harper come to the conclusion that Lamarr was utilising her hypnotising techniques to make the victims unwittingly suffocate themselves by swallowing their own tongues. Her motives were a family inheritance and a sociopathic bitterness to her stepsister; the other murders were carried out to muddy the investigative waters. The FBI is unhappy that Reacher has killed one of their agents, murderess or not, but an accord is eventually reached. Jack then meets up with Jodie, and she reveals she is leaving for London in a month's time. Reacher knows he will not want to go with her, since he misses his wandering ways, and the two agree to spend one last month together.