Trigger Warning: Book Three of The Twin Tiers Serial Killers trilogy

The final book of The Twin Tiers Serial Killers trilogy is TRIGGER WARNING. Three serial killers are on the loose in the mostly rural area of Northeast Pennsylvania and Southeast Upstate New York, known as the Twin Tiers. The serial killers, all military veterans, are killing those that trigger them. They declare open season on people guilty of Stolen Valor, First Amendment Auditors, and people that go out of their way to harass other people and make videos of themselves doing it on the internet. They leave a calling card on each of their victims.
The FBI sends a task force into the Twin Tiers to once again attempt to track down and capture them before they can kill again. They are fighting against time to solve the case, as the killings become more frequent, each more brutal than the last. Each of their victims is tortured and killed in unique and horrific ways. Will the FBI finally be able to stop the protagonist responsible for two previous killing sprees and managed to evade the FBI every step of the way?
For the FBI Special Agent in Charge, this time it is personal. Her reputation is on the line. Not only does she have to find a genius serial killer, but she also has to deal with dissension in the ranks of her Task Force Team and superiors that are demanding results. Will she be able to stop the killings and finally bring the anti-hero to justice before he kills again, or will he disappear again, without a trace? Will his overconfidence be his downfall, or will he once again be able to slip between her fingers?