Tonja Kahlens

Leonard and Amy make an unexpected trip to Arizona to fetch Sheldon; Penny interviews for a job at Bernadette's company; Stuart's relationship with Mrs. Wolowitz disturbs Howard.

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.

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.

As members of the team investigate the death of an Afghanistan soldier training in the US, they find two other soldiers are missing. Sam is back on the team but some wonder if he is ready.

McGarrett and Grover uncover an extremist group's deadly plan as they dig into Flippa's friend's murder, and Grover has an emotional reaction to the case.