Finishing a lecture at a local college, Dr Spencer Reid is suprised to be approached by a nervous young woman who hands him a file and then disappears. After reading the file, Spencer realises he must find and work with the woman in order to bring down a large cult which she escaped from years before.

A new team member joins the BAU. She has a lot to prove to the team because she was trained by the best (Jason Gideon), but she never knew who she really was. She shares her memories with the team and also learns about her past and who she really is.

JJ has never told anyone her secret, but after several late nights and drinks, she gets closer to a particular member of the team. But what happens when one of the team's lives is at stake, and events threaten the security of the BAU family? I love Jemily.