The Black Book by James Patterson & David Ellis

Extended Synopsis

Billy Harney was born into the badge. As the son of Chicago's chief of detectives, with a twin sister also serving on the force, Billy plays it by the book. He and his adrenaline-junkie partner, Detective Kate Fenton, are willing to sacrifice everything for the job. But when a horrifying triple murder leads them to an exclusive brothel catering to Chicago's most powerful elite, the case takes a volatile turn. Assistant attorney Amy Lentini begins to suspect Billy is hiding dangerous secrets of his own, linking their fates in unexpected ways.

At the crime scene, incriminating evidence is everywhere, but the only thing that truly matters is what is missing: the madam's black book. As shock waves ripple through the city's upper crust, a desperate scramble ensues to locate the elusive ledger. With no one's motives to be trusted and the city's elite in a panic, The Black Book delivers a high-stakes web of corruption where a single missing item possesses the power to destroy everything.