Lightman investigates Zach Morstein, the creator of a social networking site who becomes a murder suspect when one of the co-founders ends up dead, after expressing to Gill she is being extorted by her partner.

Lightman investigates the kidnapping of a child. As he digs deeper in the investigation, he finds out the mother hides a few secrets of her own.

Lightman is hired to investigate three high school students responsible for a fatal traffic accident.

Lightman is hired by a wealthy woman to look into her new boyfriend’s background.

Lightman tries to get a patient released from a mental hospital, in the process he questions his own sanity forcing him to face his own past.

Lightman is convinced by Det. Wallowski to investigate the murder of the daughter of a terminally ill restaurant owner, who’s an old friend of hers. Meanwhile, Torres is mugged and attempts to help the perpetrator.

Lightman tries to help a woman with early-onset Alzheimer’s piece together her fragmented memories, but it uncovers a deadly secret.

Lightman tries to free a wealthy woman from the control of a cultlike leader.

Lightman investigates the death of six miners in a coal mine explosion; he believes foul play may have been involved, so he puts his own life at risk to uncover the truth. Meanwhile Foster and Torres work pro bono on an FBI case.

The Lightman Group are hired to examine an art museum staff to ensure no security information gets out before a major exhibition. In the process, Lightman becomes involved in a game of cat-and-mouse with a beautiful woman.