Judged: An Agent Hank Rawlings FBI Thriller, Book 4 in Bloomington, MN

Judged: Book Four in the Agent Rawlings Series of FBI Thrillers.
Dead bodies are being found all over Miami. Agent Hank Rawlings has had his sights set on this vigilante serial killer for months. When a husband and wife are found murdered, their bodies accompanied by letters confessing their past crimes, Hank and Agent Beth Harper immediately leave for Florida.
In Miami, the vigilante's actions are on the tips of everyone's tongues. With the killer targeting only criminals, some of the public believe the man's actions to be justified.
With the help of a local agent and a familiar Miami Police lieutenant, Hank and Beth must weed through the evidence to close in on their killer. With each passing moment and each new piece of evidence, the killer's list gets shorter, and the true reason for his murders becomes clear.