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Pierce is accused of stalking Caroline which brings his mental stability into question. Moretti teams up with a Canadian inspector to find the real stalker.
A close friend of Pierce's is murdered and he receives word that the CIA might be murdering U.S. citizens. Moretti decides to tackle her trust issues.
Lewicki's brother, Kenny, makes a surprise visit. When he's later named as the suspect in a murder, Pierce's loyalties are torn between friendship and justice. An enticing offer makes Lewicki question Pierce's loyalty to him.
Pierce helps out when an autistic teen is under investigation for murder with help from his hallucination Hall of Famer Mordecai "Three Finger" Brown. Dean Haley sets out to convince a neuroscience prodigy to attend CLMU.
Pierce and Donny try to clear Moretti's name when she faces criminal charges from her work on a dangerous case. Conflicting evidence has Kate doubting her innocence.
Donnie's efforts to help a war hero end up with major implications. A fling from Pierce's past shows up.
Pierce is sure that a psychiatric hospital is full of secrets after he investigates a stabbing there.
A deathbed confession about a 1992 hit-and-run murder sends Moretti to Pierce for his help in determining the dying man's credibility. But when the man's physician says his patient's tumor has mysteriously disappeared, the case gets complicated. Pierce and Moretti must dig into the past to uncover the truth.
When Pierce teams with Donnie to investigate a new brain device that aims to control tremors their alliance is tested when the case turns to murder. Lewicki learns a valuable lesson about dating.
Pierce and Morretti dive into the world of Caleidoscope to solve the murder of a man who spent most of his time playing the virtual reality online game. But Pierce has trouble telling the difference between reality and fantasy after he creates an avatar of himself.
Moretti questions why Pierce is working a case without her after he accepts an invitation from a renowned environmental activist. The case involves a chain of abnormal neurological reactions, but Pierce's examination of the group of young girls involved uncovers a dark secret.
Donnie doubts Pierce's theory about inattentional blindness as it relates to a series of bizarre public murders. But Pierce has a way to prove his point so they move quickly to piece together the clues and outsmart the clever killer before he can murder again.
Pierce and Moretti deal with a woman who says aliens have abducted her husband. Meanwhile, Pierce's relationship with his real-life girlfriend, Caroline, could be in trouble if he can't rid imaginary Natalie from him mind.
When Pierce is asked to verify the mental competency for a man being retried for murder, his findings bring up more questions. Meanwhile, Moretti's soon-to-be-ex-husband Donnie Ryan is the Assistant U.S. Attorney prosecuting the case.