O, the name which threatens every shifter in the country. No one has ever actually seen O, whose victims are always the Alpha's. The pack wolves despise him while the rogues adore this killer.

Duncan Rhoades, new Alpha of the Emperor pack is on a hunt. Having sworn to take revenge for his father's death he wants to hunt, torture and kill this mysterious murderer O.

He had perfectly planned his hunt when he had set foot on the Supreme Pack where O has been currently taking refuge. But there was one unexpected glitch in his perfect plan. He had never hoped to find Seline, his mate, who he thinks is O's sister.