Bosch has a cold case. He went into his previous work post and want some note on the case.
He was caught by Renee when he opened a locked file cabin.
So he told her. There was a cold case nine years ago. And the victim's mother seek his help to find the killer.
He is having a relationship with this person. She was an addict after her daughter got killed and now staying at Bosch place.
This is not that complicated.
Renee is also having a relationship with the lifeguard she knew when she was sleeping on the beach. Which is most of the time. She didn't get much sleep and was there with her dog.
How would that work? Going back to the case and check all the alibi and interview anyone who might know something.
Bosch is a middle aged man. Renee is young but emotionally damaged. Interesting to throw these two together on a case.