Jennifer Christopher

Reid makes a connection with an autistic child that could assist the BAU in finding the boy's missing parents. Also, Prentiss enlists two former Interpol colleagues in hunting an old nemesis.

In an episode directed by and guest-starring Peter Weller, the team takes on the case of Dr. Peter Treiber (guest star Jamie Elman), a pathologist at Princeton-Plainsboro Teaching Hospital who knows too much about the hospital staff to trust any of the physicians. The only person he does respect is House, who has mysteriously gone missing. With House in absentia, the team has to figure out how to treat Treiber while making him believe that House is calling all the shots.

Jane agrees to once again pretend to be a renowned psychic and be used as bait in an attempt to lure out a serial killer and give the FBI a chance to apprehend him. In the series finale episode, Lisbon accepts Jane's surprise marriage proposal, but a killer's quest for revenge may cost them the happy ending they've worked so hard to achieve.

The Lightman Group investigates the murder of a journalist friend of Lightman’s who was exposing a corrupt politician, a case that tests Lightman’s relationship with Reynolds and the FBI. Meanwhile, Emily’s newfound interest in dating makes her father uncomfortable.

Connor and Oliver's big wedding day has arrived, but there's murder in the air; and the mystery of who the unlucky victim is will be revealed.