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.
Richard and his friends dream of making it big. Meanwhile, Richard's boss offers to buy out his firm, but a rich investor makes a competitive counter-offer.
The new and improved Pied Piper worries Richard but impresses Dinesh and Gilfoyle; Jared and Erlich confront a housing issue; Gavin suggests a controversial move.
Richard goes on the warpath and faces a tough decision; Erlich approves of Laurie's new choice; Dinesh and Gilfoyle weigh their options; Gavin tries to improve his image; Big Head gets wind of major changes.