Susan vows to get the most out of life when she learns that her dialysis isn't working and that, unless she receives a kidney transplant soon, she will die.
The BAU team investigate a string of brutal bludgeonings in Philadelphia and is led to the city's boxing scene in search of the killer.
Jess tries to convince her friends that she is content to be single on Valentine's Day. Winston's plans to propose to Aly are accelerated.
When June realizes she may like Mark as more than just a friend, she decides to explore a relationship with him. Meanwhile, Chloe takes advantage of members at an AA meeting.
Ramona and Donovan enact their plan for revenge. Liz Taylor finds true love. The resident of Room 33 is revealed.