Frank is back on the hunt, and the team must protect Gideon while he profiles Frank again. Elsewhere, the team faces a review with some surprising results.
The BAU team looks into the real reasons behind an apparent mass suicide of a small group of youths at a military academy. Also, Hotch and Morgan butt heads when a team member could be in jeopardy.
The BAU is called to San Francisco to investigate a possible Zodiac Killer copycat. Meanwhile, Reid wonders what he's done in his life as he reaches 30.