Thirty-year-old Helen Clarvoe is scared and all alone. The heiress of a small fortune, she is resented by her mother and, to a lesser degree, her brother. The only person who seemingly cares for her is the family’s attorney, Paul Blackshear. A shut-in, Helen maintains her residence in an upscale hotel downtown.

But passive-aggressive resentment isn’t the only thing hounding Helen Clarvoe. A string of bizarre and sometimes threatening prank phone calls has upended her spinster’s routine. Increasingly threatened, she turns to a reluctant Mr. Blackshear to get to the bottom of these strange calls. Blackshear is doubtful of their seriousness but he quickly realizes that he is in the midst of something far more sinister than he thought possible. As he unravels the mystery of the calls the identity behind them slowly emerges, predatory and treacherous.