"The Bittersweet Science" is the tenth episode of Season Seven of Criminal Minds.


The BAU investigates a spree killer in Philadelphia and is led to the city's boxing scene in search of the unsub. Also, Hotch makes a connection with an attractive runner as they both train for a triathlon.

Guest Cast

Referenced Criminals


  • "Turn a Light On" by Kathryn Calder

Bookend Quotes

  • Aaron Hotchner: "Everybody wants to go to heaven, but no one wants to die." Joe Lewis
  • Aaron Hotchner: Hermann Hesse wrote, "Some of us think that holding on makes us strong, but sometimes it is letting go."

Criminal Minds Episodes