Night Calls — Rex Anderson

Something very unpleasant is happening in Houston. Chad Palmer, owner of a lighting store, has become the target of a homicidal maniac. With frightening regularity, the disturbed killer telephones Chad and forces him to listen helplessly as he kills his female victims. At first, the solution to the murders seems simple: a police wiretap, call tracing, and it will all be over with. But the killer's too-clever technique prevents call tracing, and he continues calling Chad, chatting with him more and more familiarly, and then killing another woman. At last, the agonized Chad convinces the police to try something unorthodox...