Mary helps her latest witness, a homeless man who's struggling with the program, find his birth parents. But the search could cause more problems than she anticipated. Elsewhere, Scott asks to borrow more money, raising a red flag for Brandi.

Mary must protect a priest who witnessed the murder of a stripper in the Season 3 finale, but she soon learns that the priest is obsessed with saving another woman from a similar fate. Meanwhile, Brandi moves in with Peter, Stan informs a dead witness' daughter about the truth of her father's absence and FBI agent Mike Faber returns.