Billy Harney was born to be a cop. The son of Chicago's chief of detectives, whose twin sister is also on the force, Billy plays it by the book. Alongside Detective Kate Fenton, Billy's tempestuous, adrenaline-junkie partner, there's nothing he wouldn't sacrifice for his job. Enter Amy Lentini, a hard-charging assistant state's attorney hell-bent on making a name for herself - who suspects Billy isn't the cop he claims to be. They're about to be linked by more than their careers.

Weeks before NYPD Detective Michael Bennett is to marry his longtime love, Mary Catherine, an assassin announces his presence in the city with a string of grisly murders. Each victim is a young woman. And each has been killed in a manner as precise as it was gruesome. Tasked with working alongside the FBI, Bennett and his gung-ho new partner uncover multiple cold-case homicides across the country that fit the same distinctive pattern—proving the perpetrator they seek is as experienced at ending lives as he is at evading detection.

Kay Willingham led a life as glamorous as it was public - she was a gorgeous Georgetown socialite, philanthropist, and the ex-wife of the vice president. So why was she parked in a Bentley convertible idling behind a DC private school, in the middle of the night, with the man who was the head of that school? Who shot them both, point blank, and why? The shocking double homicide is blazed across the internet, TV, newspapers - and across Alex Cross's mind. Kay had been his patient once. And maybe more.