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 is hired to investigate three high school students responsible for a fatal traffic accident. The investigation takes a turn when a heroic paramedic seems to be involved in several accidents, as she seems to be the first to show in every scene.
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. After initially suspecting the man's sons, Lightman's investigation leads him to a surprising discovery. Meanwhile, Torres is mugged and attempts to help the perpetrator.
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.