Cal probes the death of a social-network cofounder who had feared that she was being squeezed out by her partner.

Cal investigates the abduction of a baby and comes to believe that the child's mother is hiding something.

Cal probes a fatal traffic accident caused by three teens.

A wealthy woman wants Cal to conduct a background check on her new boyfriend, who turns out to be quite a "social chameleon."

Cal commits himself to a mental hospital to investigate whether a patient is being held there legitimately and comes to question his own sanity as well. He also confronts his past in hallucinations in which he reminisces with his late mother and confronts his father.

A terminally ill restaurateur hires Cal to track down his murdered daughter's killer. She had been first in line to inherit her father's successful restaurant chain, and Cal discovers that this fact could have something to do with her death.

Cal helps a woman with early-onset Alzheimer's reconstruct a memory, and unearths a secret that could prove deadly in the process.

Cal goes head-to-head with a self-help guru to free a wealthy woman who might be under his control. Cal also suspects the group of threatening him and Emily.

Cal investigates a coal-mine explosion that killed six miners, and he suspects foul play. So to prove it he goes into the mine. Meanwhile, the FBI seeks the Lightman Group's aid again, and Foster and Torres offer to work pro bono.

The Lightman Group's expertise is called into question when a woman plays cat-and-mouse with Cal while he's checking for security leaks at an art museum prior to a major exhibition.

The Lightman Group is hired to look into police profiling following an incident involving Wallowski, and it turns out that Internal Affairs want Cal to incriminate her.

Lightman defends a falsely accused man from an angry mob. In the course of proving his innocence, Lightman unearths a secret that allows a mother and daughter to begin to heal.

Tim tries to stop a man bent on revenge from robbing a bank and in the process holds a guilty man accountable for his actions.