The "maddog" murderer who is terrorizing the Twin Cities is two things: insane and extremely intelligent. He kills for the pleasure of it and thoroughly enjoys placing elaborate obstacles to keep police befuddled. Each clever move he makes is another point of pride. But when the brilliant Lieutenant Lucas Davenport, a dedicated cop and a serial killer's worst nightmare, is brought in to take up the investigation, the maddog suddenly has an adversary worthy of his genius.

By age twenty-four, Letty Davenport has seen more action and uncovered more secrets than many law enforcement professionals. Now a recent Stanford grad with a master’s in economics, she’s restless and bored in a desk job for U.S. Senator Colles. Letty’s ready to quit, but her skills have impressed Colles, and he offers her a carrot: feet-on-the-ground investigative work, in conjunction with the Department of Homeland Security.

Virgil Flowers kicked around for a while before joining the Minnesota Bureau of Criminal Apprehension. First it was the army and the military police, then the police in St. Paul, and finally Lucas Davenport brought him into the BCA, promising him, "We'll only give you the hard stuff." He's been doing the hard stuff for three years now, but never anything like this.

Doris Grandfelt, an employee at an accounting firm, was brutally stabbed to death . . . but nobody knew exactly where the crime took place. Her body was found the next night, dumped among a dense thicket of trees along the edge of an urban park, eight miles east of St. Paul, Minnesota. Despite her twin sister Lara Grandfelt’s persistent calls to the Bureau of Criminal Apprehension, the killer was never found.

Renée Ballard works the night shift in Hollywood, beginning many investigations but finishing none, as each morning she turns her cases over to day shift detectives. A once up-and-coming detective, she's been given this beat as punishment after filing a sexual harassment complaint against a supervisor. But one night she catches two cases she doesn't want to part with: the brutal beating of a prostitute left for dead in a parking lot and the killing of a young woman in a nightclub shooting. Ballard is determined not to give up at dawn.