Lisbon and the team are assigned to the case of a State Senator's murdered intern. Meanwhile, Jane tries to find out what new information Bosco has on the Red John case.
Nielsen Ratings: The Scarlet Letter was seen by 15.75 million people, and was rated 10.1/17 in households, 4.9/13 in adults 25-54, and 3.8/11 in adults 18-49.