Empties — George Zebrowski

In this nightmarish tale, a third-rate detective is faced with an impossible crime, as bodies are turning up without their brains and without any indication of how the organs were removed. His only lead -- an attractive landlady -- becomes more than a lead and drives him into a world of terror, where his sanity is questioned and he must stop the monster before she does more evil. Or should he join her? Does he even have a choice, or will he just be driven by terror?