In the series finale, Moretti goes missing on the day of her wedding, and Pierce soon discovers that she's been abducted by a dangerous person from his past.
Pierce attempts to find the killer of a student while defending the victim's boyfriend, who is believed to be mentally ill and guilty of the crime. Pierce has to face up to his feelings about Kate as her wedding day nears.moreless
Pierce and Moretti stumble on an international scandal when investigating the murders of a Bangladeshi diplomat and a Chicago reporter. Kate struggles as she prepares for her wedding so she asks Pierce for help.moreless
Laura's ex-fiancé becomes a murder suspect in a former beauty queen's stabbing death. As Laura reminisces, the investigation leads the team into the world of holistic healing.
Moretti goes undercover to investigate the brutal murders of meat-company owners. Meanwhile, Pierce contemplates making a personal confession to Moretti.
Daniel's father and his friend Dean Haley are faced with the decision on whether to allow Pierce to undergo a high-risk surgery for his traumatic injury. Daniel works on solving a different kind of murder case.moreless
Pierce helps Donnie when Donnie finds himself in a compromising situation and evidence stacks up against him. Meanwhile, Pierce's father assaults someone at an assisted-living facility.
A sniper targets the Federal Building lobby, putting Moretti and Donnie in the crosshairs. Before long, Pierce concludes that the shooter fears low-frequency radio waves. Meanwhile, a beguiling woman prompts Donnie to run for office.moreless
A missing FBI agent is found dead in an investigation that forces Pierce to face a past unsolved case, and Pierce's therapist grows concerned that the investigation may exacerbate Pierce's condition.
Pierce witnesses the death of a gallery owner, but he comes to believe it was actually a murder. Pierce and Moretti try to hunt down the killer, only to end up in the middle of a daring art heist. Meanwhile, Pierce analyzes his relationship with Natalie.moreless
An infant is reported stolen. Moretti tracks the kidnapper, only to make a bizarre discovery. Elsewhere, Pierce and Moretti probe a related murder, and Donnie sets out to buy a house in the suburbs.moreless
A notable neuroscientist is found dead, and Pierce and Moretti must determine how the killer infiltrated the victim's impenetrable study to commit the deadly deed. Meanwhile, Pierce's father moves in with Pierce and Lewicki.moreless
Pierce examines a woman who has confessed to a murder and claims to be possessed by the devil. Meanwhile, obstacles mar Donnie and Moretti's wedding plans.
A boy with a developmental disorder is taken hostage during a bank robbery. Elsewhere, Pierce's estranged father visits.
A prosecutor mysteriously drops dead in the courtroom, trigging an investigation by Pierce and Moretti. Meanwhile, Moretti and Donnie make important life decisions.
Season 3 opens with Pierce's new life in Paris upended when he's enlisted to probe a risky international case. Elsewhere, Max and Dean Paul Haley scheme to bring Pierce back to Chicago.
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.moreless
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.moreless
Strudel's electronic scrambling device goes awry and causes Lucky to act zany. Meanwhile, Niblet must make a difficult decision about his new best friend.
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.
Two of Patches' old friends tease him for hanging out with girl pups.
Donnie's efforts to help a war hero end up with major implications. A fling from Pierce's past shows up.
Strudel begins leading a double life after being mistaken for a superhero, but her new job threatens her position on the team.
Strudel is challenged with finding the perfect people for energetic pup.
Pierce is sure that a psychiatric hospital is full of secrets after he investigates a stabbing there.
A heroic rescue dog arrives at the shelter without any fur; Squirt makes him a full-body toupee, but the pup's lack of confidence makes it difficult to find him the perfect home.
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.moreless