I kill, therefore I am...

Voices slam through the corridor of his wounded mind. The words of his dead sister cry out. His parents' taunts fill the silent room where he sits and waits—waits for the murderous rage, filling him with strength, driving him to kill, to touch the cold flesh, taste the warm blood—to feel alive again... A witness has seen him, but his killing only turns her on and now she wants to protect him. His wife suspects him, but the private detective she hired cannot stop him. Joe MacAree fears nothing—except that he may no longer be human. The thirst that drives him is relentless, moving deeper and deeper into his own shattering, private realm, where each murder is a delicious new gift of life, where revulsion is beauty, and the obsession will never let him go.

Obsessed was part of Dell Abyss' remarkable horror line, lauded by none other than Stephen King.