Rochelle Aytes

The charred remains of a young Jeffersonian intern, the daughter of a highly respected former Jeffersonian scientist, are found in the building's incinerator. With the case hitting so close to home, the team has no choice but to suspect their own colleagues and question everyone from the upper echelons of the Jeffersonian scientists to the victim's fellow interns. When they learn that the intern had been working on artifact authentication for the Widow's Son serial killer case. they begin to wonder if her involvement could have put her life in danger. But when they discover a romantic link between the intern and a Jeffersonian employee, the motives behind her murder become even more complicated. Meanwhile, Booth agrees to pose as Cam's boyfriend and accompanies her on a family get-together, eliciting more attention than he bargained for from Cam's sister.

When teenagers who were reported missing are suspected of a series of mass murders in Chicago, the BAU investigates their whereabouts to find a motive for the crimes.

Preston and Porter move out; Gaby and Carlos visit her hometown; Keith asks Bree to move with him to Florida; Susan uses her ailment to get special treatment; Paul makes a decision about Beth.

Lynette tries to talk her mother out of marrying an obnoxious man; Bree runs into Keith's ex-girlfriend and makes a shocking discovery about his past; Carlos starts to worry about Gaby's obsession.

When the BAU investigates several murders in the Pittsburgh area, the team searches for a pair of UnSubs working as a team. Also, Garcia and Morgan share their Valentine's Day plans for their respective significant others.