A.J. Achinger

As Derek prepares for his move to DC, Meredith keeps herself busy at the hospital. Meanwhile, Jackson and April deal with difficult news, and Arizona and Amelia discuss how to best approach Dr. Herman.

The BAU travels to Chicago to investigate a series of mass murders, after teenagers in a missing persons report become the main suspects.

Frankie Jr. is brought in to help with a murder case involving a youth hockey league; Cailin asks to stay with Maura; Maura has trouble living with a teenager.

Emmalin has college issues; Michael's career path is unclear; Claudia Joy must choose sides; Denise returns to work; Roxy supports Trevor.