Prey for Mercy

Some killers are made through years of systematic abuse. Some killers are the product of the societal misfortune of not being able to escape the worst portions of the lowest economic areas. Then there are the killers like Mercy. The rare ones. The ones who are born evil and are drawn to violence and the suffering of others with the same natural inborn instinct that allows any predator to hunt. Yes, even the predators can be hunted themselves. But that is a dangerous hunt with the unwavering danger that the predator will kill the one who is hunting it. Will the training of the hunters of the law be able to best a predator with a lifetime of experience or will their quarry strike one of their own, turning the hunters into the hunted?