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After Kristine suffers a stroke, Alex discovers the nurse's past may not be as she remembers, so Alex teams up with Charlie to find a way to bring peace to the already troubled spirit.
Alex and Cassie try to free a young woman from her abusive partner; a patient's pacemaker malfunctions.
On the season 4 finale, Charlie's condition proves more dangerous than initially thought, as Alex and Shahir struggle to save his life.