Lightman’s plan to infiltrate a robbery goes awry when he discovers one of the robbers is seeking revenge, not money.

The Lightman Group investigates an abuse accusation at a beauty pageant, focusing on a mother-daughter duo with a dark secret.

Lightman’s relationship with Detective Wallowski gets complicated when Internal Affairs attempts to incriminate her.

The Lightman Group gets taken for a ride when a clever museum thief attempts to evade their investigation.

Six deaths in a coal mine explosion appear to be foul play. In order to find out, Lightman puts himself in the same dangerous situation.

After a member of a cult tries to commit suicide, Lightman devotes himself to exposing the leader.

Lightman works with a woman with early-onset Alzheimer’s to uncover a traumatic memory from her past, and in the process discovers there may be a killer working at her health care facility.

Lightman reveals a surprising suspect in a fatal armed robbery at a barbeque joint.

Lightman’s own sanity is challenged as he tries to determine whether a man at a mental hospital is being held against his will.

The group reveals a con after being hired to check into the background of the boyfriend of a wealthy woman.

After a fatal traffic accident, Lightman is hired to investigate the three high school students who were responsible.

In the wake of a kidnapping, Lightman digs deeper to discover a family in desperate need of repair.

In the season finale the Lightman Group becomes involved in the investigation of terrorist bombings in the D.C. area which becomes personal as Torres’s boyfriend is in danger.