A student tips off Pierce about a potential conspiracy to cover up the murder of a U.S. Senator.

Moretti faces criminal charges after taking matters into her own hands on a dangerous case; Pierce and Donnie try to clear Kate's name.

When Donnie finds himself in a compromising situation, he calls Pierce for help. As the evidence begins to stack against Donnie, Pierce and Moretti struggle with their own fears and doubts, as they work to solve the case. During the chaos, Pierce must deal with his father after he assaults someone at the assisted living facility.

When a series of bizarre public murders occur, Pierce realizes that the killer is trying to send a message about inattentional blindness, but Donnie doubts this theory. But Pierce has a trick up his sleeve that can prove his point, and they must scramble to piece together the clues before the clever killer can make any more examples out of innocent victims.

Moretti learns that there may be some truth to Pierce's conspiracy theory; Pierce's new doctor forces him to face the truth about Natalie.

Donnie tries to help a war hero who suffers from a neurological disorder; Pierce is surprised by an old flame.

Pierce's mental stability is questioned and his job threatened when he is accused of stalking his ex-girlfriend, Caroline Newsome. As the situation escalates, Moretti works to find the real stalker with help from a visiting inspector from Canada.

After a missing FBI agent turns up dead, Pierce is forced to face the one case he was never able to solve. When they discover that the killer is still out there, Pierce agrees to help Moretti, against the wishes of his therapist, Dr. Rosenthal, who believes it will only exacerbate Pierce’s condition.

Pierce investigates a stabbing at a psychiatric hospital and becomes convinced that the hospital is full of dark secrets.

Pierce and Morretti plunge into virtual reality to solve the murder of Kurt Simpson, a man who spent most of his time in a massive multiplayer online game called Caleidoscope. After creating an avatar of himself to investigate the crime, Pierce struggles more than ever to distinguish between reality and fantasy.

Pierce and Moretti race to find clues when a serial killer from 1986 begins killing again. They catch a break when they learn that one of the victims is actually alive. Moretti's dad, one of the investigators on the original case, offers his daughter advice. Pamela Reed also guest-stars as the mother of the surviving victim, while Armin Shimerman is the victim's psychologist.

A new brain device to control tremors seems to have a defect that turns out to be far more serious than a technical malfunction, and Pierce partners with Donnie to investigate. Their unlikely alliance is tested when the case escalates to murder. Meanwhile, Lewicki learns a valuable lesson about dating.

Agent Kate Moretti goes under cover to investigate an animal rights group suspected of foul play; Pierce considers making a confession to Kate.

Pierce and Moretti uncover an international scandal while investigating the murders of a Bangladeshi diplomat and a Chicago reporter; Moretti struggles with the preparations for her upcoming wedding.

After Dr. Daniel Pierce suffers a traumatic injury, his father and his friend must decide if they should allow him to undergo a high-risk surgery; Pierce begins to question everything he sees and hears.

When a student is found murdered, Pierce tries to find the killer while defending the victim's boyfriend; Pierce must confront his feelings as Kate and Donnie prepare for their wedding day.

When Moretti goes missing the day of her wedding, Pierce and Donnie set off in pursuit of the runaway bride. They soon learn that Kate has been abducted by a dangerous person from Pierce's own past. Now, Pierce and Donnie must risk everything to save Moretti before it's too late.

Neuroscience professor Daniel Pierce (Eric McCormack) is recruited by a former student, FBI Agent Kate Moretti (Rachael Leigh Cook), to help out on a case involving the death of a pharmaceutical executive. But Daniel's schizophrenic hallucinations could potentially derail the investigation.

Pierce is enlisted to help crack the case of a murdered mail-order bride. A twist marks the investigation when it's discovered the prime suspect suffers from an unusual condition. Elsewhere, Moretti is drawn to a handsome new professor.

After a young victim with a developmental disorder is taken hostage in a bank robbery, Moretti brings in Pierce to interview the boy. When they finally track down the culprits, they discover the case is about much more than money. Meanwhile, Pierce’s estranged father James pays him a visit.

Moretti calls on Pierce to examine Elena Douglas, a woman who has confessed to murder and claims to be possessed by the Devil. Meanwhile, Donnie and Moretti’s wedding plans hit a bump in the road.

When renowned neuroscientist Landon Jennings is found dead, Moretti and Pierce must figure out how someone could have gained access to his impenetrable study in order to kill him. Lewicki finds himself with twice the work when Pierce’s father James moves in with them.

FBI Agent Kate Moretti asks Dr. Daniel Pierce to determine the mental competency of a man being retried for murder. But the trial takes a shocking and unexpected turn when Pierce’s findings question whether the person standing trial is the same person he was six years ago. Meanwhile, Moretti is unpleasantly surprised to discover that the Assistant U.S. Attorney prosecuting the case is her soon-to-be-ex-husband Donnie Ryan.

Donnie and Moretti are caught in the crossfire when a sniper shoots up the lobby of the Federal Building. When Pierce determines that the shooter is afraid of Extreme Low Frequency radio waves, he and Moretti take a trip to the Quiet Zone in Virginia, where they think the shooter is hiding out. Meanwhile, an alluring woman named Shelby Buchanan courts Donnie to run for political office.