Prentiss
The episode touches on Prentiss' undercover work taking down IRA terrorist and arms dealer, Ian Doyle. Doyle abducted and tortured Prentiss-- she was marked with a four-leafed clover brand and stabbed in the abdomen. Prentiss worked with J.J. to escape Doyle by faking her death. Her headstone was marked with the motto of the FBI: “Fidelity, Bravery, Integrity.”
