Dr. Kate O'Rourke has dedicated her life to her career, leaving little time for personal relationships. When a secret admirer begins showering her with attention, Kate begins to fear for her safety. Then a gorgeous mystery man moves into the apartment next door, and Kate unexpectedly finds herself with a few dangerous cravings of her own. Bizarre things are happening all around her, and the world as Kate knows it unravels at the seams. The only thing she is certain of is that her seductive new neighbor seems to be the key to unlocking the puzzling riddle that has become her life. Coerced into assisting the Task Force for Rogue Apprehension, Styx temporarily relocates under an assumed identity. Without warning, the Rogue he is hunting...aptly dubbed the Collector...steps outside his modus operandi and fixates on a beautiful ER doctor. Styx insinuates himself into her life in hopes of stopping the killer. But all too quickly, the killer isn't the only one obsessing over the irresistible doctor. Shocking disclosures soon come to light about the woman Styx has been assigned to protect, and dark secrets from Styx's past come back to haunt him, putting Kate in jeopardy. If he refuses to break an old vow, Kate's life could hang in the balance...but if he goes back on his word, Styx just might kill her himself.