Stephanie Katherine Grant

The BAU travels to the Midwest to track a serial killer who is targeting families in Nebraska and Iowa. Meanwhile, a troubled Ellie Spicer runs away from her foster family to visit Agent Derek Morgan, which creates concern.

As Adam (Sean Giambrone) goes to great lengths to avoid swimming at school, jealousy prompts Barry (Troy Gentile) to undermine Erica’s (Hayley Orrantia) effort to make the world a better place.

While Adam (Sean Giambrone) worries about sexual tension between him and his longtime friend Emmy (guest star Stephanie Katherine Grant), Erica (Hayley Orrantia) and Beverly (Wendi McLendon-Covey) square off over a lack of trust.

In the Season 3 premiere, Erica and Barry help Lainey plan a big house party inspired by the movie "Risky Business" while her dad is out of town. However, it's Beverly who comes to the rescue when things get out of hand. Meanwhile, Murray grows annoyed with how much time Adam is spending on the phone with Dana, who he struggles to stay in touch with now that she has moved away.

To get his little brother his first kiss, Barry (Troy Gentile) hosts a “no parents allowed” birthday party in the basement for Adam (Sean Giambrone) – and sparks some surprisingly protective instincts in Erica (Hayley Orrantia).