Ralph's classmate goes missing on a field trip following an accidental encounter with a dangerous criminal; Toby gets close to learning who Happy's husband is.
Events take an unexpected turn at the Los Angeles Natural History Museum when a seemling-simple task leads Team Scorpion to discover a robbery in progress.
The BAU is asked to help the Centers for Disease Control when they believe that a series of mysterious deaths in Virginia could be the act of bioterrorism.
A series of mummified remains from multiple victims are found inside an elderly couple's home; Rossi attempts to reestablish a connection with his ex-wife.
The BAU investigates rumors of an elusive "Tall Man" who is believed to be responsible for three missing people in JJ's home town of East Allegheny, Penn.
The BAU helps local law enforcement in Tallahassee, Fla., investigate a ritualistic murder; Prentiss worries about Garcia's behavior after her abduction.
The New Orleans team comes across a surveillance van that is full of photographs that document every detail of Pride's personal and professional lives.