Dr. Dennis "Whitaker" Winchester, Emergency Medicine doctor, Former hunter, lives his day out in Pittsburgh working in the Emergency room at Pittsburgh Trauma Medical Center. He left the family business behind, the whole "Saving People, Hunting Things" for a sliver of a chance at a normal life. And his life is just that, Normal. That is until a trauma comes through the Pitt that leaves everyone scratching their heads, except for Dennis, Dennis has seen this very type of injury before and he knows that it is a matter of time before his old life comes crashing through those ER doors and he is absolutely terrified of what that might mean.