Kristen Ariza

Meredith tries to save the life of her father, who comes to the hospital with a failed liver; Izzie empathizes with a patient riddled with tumors.

A night at Mike's piano bar gives Monica a very showy moment in the spotlight. Ross works on trying to move on after he witnesses Rachel and Gavin kissing. Chandler uses his skill to repair Joey's botched eyebrow job.

Cal Lightman and his team assist federal law enforcement in the specialist field of lie detection. Lightman turns his talents to solving a teacher's murder.

The BAU team head to rural Oklahoma as women are being found murdered and robbed of one of their five senses. Meanwhile, JJ and Prentiss get the cold shoulder from Reid.

The daughter of a federal judge is murdered and investigation is carried out at the girl's high school. The Lightman Group also investigate the case of a NASA test pilot accused of intentionally crashing aircraft of multimillion dollar value.

The team look into the case of a consortium of investors who were scammed for millions of dollars. Elsewhere, when two women commit suicide, it is Lightman who obsessively investigates. Torres suspects that Lightman's attachment to the case may be more personal than professional.