Mary's newest witness is a homeless man (Esteban Powell) who exposed a pipe bomb plot. As he struggles to conform to the rules of WITSEC, Mary agrees to help him search for his birth parents; which presents unexpected problems when they are found. Also, Stan and new office recruit Charlie (Keith Nobbs) get a tip from a talkative witness (Matt Winston) to bust a most-wanted fugitive. Meanwhile, Brandi becomes distrustful of Scott (Aaron Ashmore) who once again needs money, which leads her to take some financial advise from Peter (Joshua Malina).