Joyce Greenleaf

Agent Hotchner revisits the first case he worked at the BAU, when details come forth that one of the deadliest serial killers in New England's history has struck again after a 10-year hiatus.

Denise goes undercover to find a missing boy, while Denny's carefree attitude on guns is scrutinised after a mishap at a paintball session.

House shares explicit medical stories with students at a school's career day; two fifth-graders try to help House understand how his antics prevent him from showing Cuddy how he feels.

An anxiously anticipated letter reveals how Rebecca has been spending her time after work; Bobby seeks approval from his father.

Peggy comes to a shocking realisation but isn't aware her true enemies are closer than she thought. Sousa narrows in on the truth about Peggy.

Nina finds a new friend in a forensics analyst; Nina's new friend takes the meaning of loyalty too far; Carlos is forced to stay with Phil for a few days.