Desert Star by Michael Connelly

Renee Ballard is now head of the LAPD's Open-Unsolved Unit, charged with working cold cases. She has convinced retired detective Harry Bosch to join her team. Bosch is very interested in looking into the murders of the Gallagher family. It's a case that he worked on when he was still with the force, but wasn't able to get enough evidence to charge Finbar McShane, the man Bosch believed was guilty. Ballard also wants Bosch to help with the case of Sarah Pearlman, the sister of Councilman Jake Pearlman, who was killed in 1994. Desert Star recounts Ballard's and Bosch's journey as they attempt to solve both of the cases. It will be published in November.