Spirits intensify at Roosevelt Medical Center when Dr. Devlin and Dr. Robinson treat a priest who was bitten in the face during an exorcism of a demon. After Constantine learns that newcomer Russell King has his eye on taking over downtown, he consults Celeste and Al Trapani to help him evaluate the risks and rewards of consolidating the power in Chicago. Meanwhile, Dr. Devlin dives deeper into the fold when Nate calls her into action to aide a runaway who may have witnessed a murder.