Murder in the City of Angels

Jack Robinson is the chief of detectives for the Los Angeles Police Department. He's besieged by a murderer who calls him several days in advance to let him know somebody is going to be killed. Jack can find no reason for these senseless killings, much less the killer wanting to warn him about them. These killings take place anywhere from a few days to several weeks apart. Victims are random; young, old, male and femal