Paul Butcher

Hotch's unexplained absence quickly becomes apparent when the team is called back together to profile a killer who is targeting an emergency room doctor.

Brennan determines that Charlie was sexually assaulted before he was murdered, which leads Booth to conclude they’re on the hunt for a serial pedophile. When the prime suspect is eliminated, Booth and Brennan pay a heartbreaking visit to Charlie’s mother, Margaret, to inform her that Charlie’s killer is still on the loose.

Sipowicz is still studying for the sergeant's exam. Medavoy's trial is today. Jones is still looking for Michael, he's been in email contact with him, but Michael doesn't want to be found by his real father.

David and Keith try to overcome their problems, but Karla's secret makes things worse, and Brenda's engagement anxiety brings her to Melissa.