Rene Ballard and the LAPD's Open-Unsolved Unit find a DNA link to a serial killer known as the Pillowcase Rapist. But when Ballard and her team move in on their suspect, they encounter a baffling web of secrets and legal hurdles.

At the same time, Ballard's badge, gun and ID are stolen - a theft she can't report without giving her enemies in the department the ammunition they need to end her career. Forced to seek outside help, Ballard knocks on Harry Bosch's door.

Meanwhile, Ballard has taken on Patrol Officer Maddie Bosch, Harry's daughter, as a new volunteer. But Rene soon learns that Maddie has an ulterior motive for getting access to the city's library of lost souls.

Ballard is determined to maintain her focus on justice - but this cold case opens a Pandora's box . . .