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S02E09
The last word

The daughter of high-powered diplomats, Emily Prentiss joins the team, and she must convince Gideon and Hotch she deserves the job based on merit and 
not on her family connections. Meanwhile, the BAU is called to St. Louis to investigate two serial killers who appear to be competing with each other. 

S02E10

Criminal Minds Wiki
Lessons learned

Gideon, Reid and Prentiss travel to Guantanamo Bay to interrogate the leader of a terror sleeper cell being detained there after a chemical weapons dispersal device 
is discovered during a raid at a suspicious house. 

S02E11
Sex, birth, death

A vigilante starts killing prostitutes when he feels that his efforts to clean up thecity and get the prostitutes off the streets aren't being appreciated. 
Meanwhile, a young man seeks out Reid to help him understand the murderous urges he has had his whole life and fix them.

S02E12
Profiler profiled

While visiting his mother for her birthday in Chicago, Morgan is accused by local police for murdering three young boys, and the BAU team investigates to find the real killer and exonerate him. Meanwhile, Hotch believes that Morgan may be hiding more than his sealed juvenile record 
after questioning him.