A two sided mystery

When murders start in the city, the entire force is stuck trying to catch the killer. No matter what they do, the killer seems to be one step ahead. Detective Daniel Shane is put on the case with his partner, Andrew Tuber, with no leads, no ideas, no suspects, and no clues. But the more he investigates, the more the mystery deepens. Why does he kill? How does he choose who to kill?

But most of all, who is Joey?

Has Daniel finally found a case that he is unable to solve? Or will the answer shock him forever.