Dark Sacred Night by Michael Connelly

Bosch isn't really a cop anymore but he still investigates cases.  When he runs into Ballard, the case he's working intrigues her and she starts working on it in off hours.  They make a good team but it takes a while for trust to develop.  Can they solve a cold case nine years old?

Little, Brown and Company and Edelweiss gave me the opportunity to read this book for review (thank you).  It will be published October 30th.

Bosch has the mother of the dead girl living with him.  She's off drugs and she's still dealing with her daughter's death.  He's trying to help her but she's beyond help.

Ballard is still living with the sting of being shifted to the night crew because she turned her supervisor in for sexual harassment.  He's still got his position.  It doesn't seem fair but who cares except her?

They are going back through 3" x 5" cards the various cops made on cases hoping for clues.  There's boxes and boxes to go through.

Ballard takes Bosch out on some of her calls:  They found three boys on top of a strip club looking through the skylights.  Most of the calls were more serious than that.

There's a Mexican gang member trying to kill Bosch, Ballard is going after the killer and she gets caught in the garage  with the killer.  

Will either one of them be alive at the end of the story?  Read it and see.