The BAU team begin to track a family in Alabama who are working together to abduct young women. The family travel from city to city leaving clues behind, but their route becomes increasingly difficult to follow.
A betrayal intensifies the issues between Cristina and Meredith; Matthew and April make a decision about their relationship; Bailey faces difficulties with Ben's return.
Sheldon heads to Arizona. Leonard and Amy make an unexpected trip and follow him and Penny goes for an interview.
Dr Mallard's predecessor, Dr Magnus, joins the team to help solve a murder at a college fair.
Leslie goes all-out to save a gazebo at a mansion on the historical register from being destroyed, while April gets in trouble with Ron when she accidentally schedules 93 meetings for him on the same day.