Intent on revenge a man (Shawn Doyle) plans to rob a bank, and Lightman tries to stop him.

Lightman defends a wrongly accused man from an increasingly hostile mob. In the process of exonerating him, Lightman uncovers a dark secret that helps a damaged mother and her daughter begin the healing process.

The Lightman Group is hired to examine police profiling techniques in the wake of an incident involving Wallowski, and Internal Affairs attempts to leverage Lightman's relationship with Wallowski to get him to incriminate her.

While vetting an art museum staff for security leaks prior to a major exhibition, Lightman meets a beautiful woman who entangles him in a game of cat-and-mouse.

When Lightman investigates a coal mine explosion that killed six miners, he suspects that foul play may have been involved. To find the truth, he puts his life at risk and descends below the surface. Meanwhile, the FBI comes back to The Lightman Group looking for help with another case, and Foster and Torres offer to work pro bono.

Lightman goes head-to-head with the leader of a self-help empire to free a wealthy woman who may be under the control of the cult-like leader. When Lightman begins to investigate, things get personal as he suspects the group of threatening him and his daughter, Emily.

Lightman helps a woman with early-onset Alzheimer's solve the puzzle of her fractured memory. In the process, he unearths a secret that could prove deadly in the present.

The terminally ill owner of a successful chain of restaurants hires Lightman to fulfill his dying wish: track down his daughter's killer. In the process, Lightman uncovers the twisted dynamic of the fractured family empire, leading him to suspect sibling rivalry as the motive and that the patriarch's sons might be somehow responsible for the death of their sister, who was first in line to run the family business.

Lightman is called to a mental hospital to determine if a patient is being held against his will. Attempting to have the patient released, Lightman finds himself descending down a path that forces him to question his own sanity and brings him face-to-face with his own past.

Lightman is hired by a wealthy woman to do a background check on her new boyfriend, so he digs deep into the man's past to find out the truth about this social chameleon.

Lightman is hired to investigate three high school students responsible for a fatal traffic accident, which takes a turn for the better when he finds the heroic paramedic who was first on the scene.

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.

Foster's former patient, one of the founders of a social-networking app, comes to the Lightman Group when she thinks she's being squeezed out by her partner. When she turns up dead a short time later, Lightman fights against the prevailing evidence to expose the truth behind the murder.