Second Sight

Word of her father's imminent death forces Mac to look back at the years of anger and resentment he caused her. She is furious that a priest is trying to convince her to forgive this abusive alcoholic, who was responsible for her own alcoholism. She comes to realize, however, that perhaps her anger had been misdirected all these years when her mother shows up -- after having abandoned Mac many years earlier.
Meanwhile, Harm takes a gamble and undergoes laser surgery as a possible cure for his night-blindness.

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S04E21 - Wilderness of Mirrors