James Patterson's Detective Billy Harney is back, this time investigating murders in a notorious Chicago drug ring, which will lead him, his sister, and his new partner through a dangerous web of corrupt politicians, vengeful billionaires, and violent dark web conspiracies. In The Coldest Case: A Black Book Audio Drama, homicide detective Billy Harney sends his new partner, Kate, deep undercover in a notorious Chicago drug ring. When several members of the ring soon turn up dead, Billy abruptly pulls Kate out, blowing her cover. Kate's informant inside the gang quickly disappears. As does the ring's black book... When Billy can't find the informant, he wonders if Kate is secretly harboring her, since the two grew close during Kate's weeks undercover. As Billy and Kate investigate the ring's murders, they'll be pulled into a dangerous web of corrupt politicians, vengeful billionaires, drugged pro-athletes, and violent, dark web conspiracies, all in search of the missing black book.