Working alone as a private investigator is tough. Estranged from her PI family, Margo Angelhart does what she must to get by—including taking on sordid cases that pay the bills, even if she’d rather be helping those the justice system has failed. That is, until a cheating husband case she’s working intersects with her siblings’ corporate espionage investigation, forcing Margo to cooperate with the Angelhart firm. Now, as the siblings compare notes, it’s clear they need to work together before a white-collar crime escalates to murder.

Detective Kara Quinn, on leave from the LAPD, is on an early morning jog in her hometown of Liberty Lake when she comes upon the body of a young nurse. The manner of death shows a pattern of highly controlled rage. Meanwhile in DC, FBI Special Agent Mathias Costa is staffing his newly minted Mobile Response Team. Word reaches Matt that the Liberty Lake murder fits the profile of the compulsive Triple Killer. It will be the first case for the MRT. This time, they have a chance to stop this zealous, if elusive, killer before he strikes again.

At a Texas county fair, children’s book author Elle Portman is enjoying a rare night out with her favorite cowboy: her two-year-old son, Charlie. But just as they’re about to head home, the unthinkable happens: a shooter opens fire into the crowd, causing widespread panic to erupt all around them. Also caught in the melee is corporate consultant Calder Hudson. When he wakes up in the hospital, he's told he's lucky. Others didn't fare we well, which instills in Calder a furious determination to get justice.

From Atlanta's wealthiest suburbs to its stark inner-city housing projects, a killer has crossed the boundaries of wealth and race. And the people who are chasing him must cross those boundaries, too. Among them is Michael Ormewood, a veteran detective whose marriage is hanging by a thread and whose arrogance and explosive temper are threatening his career. And Angie Polaski, a beautiful vice cop who was once Michael's lover before she became his enemy.

In the sleepy rural town of Painters Mill, Ohio, the Amish and "English" residents have lived side by side for two centuries. But 16 years ago, a series of brutal murders shattered the peaceful farming community. Kate Burkholder, a young Amish girl, survived the terror of the Slaughterhouse Killer but came away from its brutality with the realization that she no longer belonged with the Amish. Now, a wealth of experience later, Kate has been asked to return to Painters Mill as Chief of Police. She's certain she's come to terms with her past - until the first body is discovered in a snowy field.