Toll Call — Stephen Greenleaf

He seemed to know all about her. But he wanted to know more.

Peggy had been P.I. Marsh Tanner's secretary for eight years, and he thought he knew her well. But he didn't know half as much as the phone caller, the mystery man who called Peggy at home and threatened her with mutilation if she refused to tell him her most intimate secrets and desires. And he could never have imagined that Peggy might grow to love the calls as much as she hated them.

But in the treacherous, twisted days that were to follow, there was much about Peggy--and himself--that Marsh Tanner would wish hr didn't know....