This is book number 19 in the Harry Bosch Novel series.
Hooray! Harry Bosch is back – investigating two complex but disparate cases. Retired from the LAPD, Harry’s a private detective, hired by a reclusive millionaire to find a possible heir; he’s also a volunteer investigator at a small, underfunded police department, tracking a terrifying serial rapist. One of Connelly’s very best.— Louise Jones