Published in 1991, this is (I think) the fifth of the popular Peter Decker - Rina Lazarus series. I've enjoyed them well enough to keep reading whenever a new one comes out. This one is actually set not in LA, but in Brooklyn, as Peter tracks down a runaway from Rina's extended family.
Peter and Rina spend their honeymoon with family in Broolyn, where they become involved in a case of a missing teen and a dangerous psychopath
