While the team continue their efforts to find Sydney Harrison, the hostage situation at the ransom drop continues to escalate when Jack discovers that Sam has been seriously injured and is forced to make a deal to ensure she receives medical attention.

Sydney Harrison, the owner of a small employment agency whose old office was in the World Trade Center, is kidnapped by a man in the elevator on her way to work, who demands $687,000 in exchange for her safe return.

When his unconventional methods result in the case against a child molester being thrown out of court, Jack finds himself at the center of an investigation by the Office of Professional Responsibility into how missing persons cases have been handled.

Jack and the team search for Dante Jones, a boxer who vanished just before a much-anticipated fight, and soon begin to suspect his disappearance is a publicity stunt - until his unscrupulous younger brother also goes missing.

A well-liked teacher who is eager to change the world disappears after teaching late at the high school where he works. As the team investigates, they uncover contradictory information about his background - including evidence that he might have been supplementing his income by selling drugs, despite being wealthy to begin with.

A TV reporter disappears during an investigation into a nightclub owner suspected of drug dealing. Jack and the team discover a connection with a murderer on death row and the assistant district attorney assigned to the case.

The team searches for a recently retired US army officer, Bull Carver. As their investigate continues they discover evidence that suggests Bull may have covered up a fatal incident during his service in Vietnam - which could implicate an influential Congressman.

The team investigate mentally unstable Clare Metcalf's disappearance from a psychiatric hospital, and discover the key to the case may lie in her mother's death some years previously - which was officially ruled as suicide, but may actually have been murder.

Jack and the team investigate the disappearance of newlywed, Audrey Rose-Beckworth, who goes missing from her own wedding reception. Evidence suggests that she's been abducted, but the team uncover a dark past tainted with drug abuse, and a one night stand prior to her wedding day.

The team investigates the disappearance of Linda Schmidt, a flight attendant who goes missing after leaving her apartment, supposedly heading to the airport to catch a late flight. Evidence found in her abandoned car suggests she may have fallen victim to a serial killer after meeting a man through an internet dating service.

When Chet Collins, who's young son went missing 6 years ago, also disappears himself, the team discovers that Chet found a break in the case and become concerned that the desperate father has taken matters into his own hands.

The team is called in to locate a pregnant woman who has absconded from hospital in a desperate bid to escape her violent husband, but the investigation becomes doubly urgent by the revelation that she is suffering from a potentially fatal illness.

The citizens of a small Long Island town are shocked when 13-year-old Annie Miller disappears on her way to school. Twenty-four hours after Annie's disappearance, her best friend, Siobhan Arintero, also vanishes, leaving only a collection of homemade videos to help find the two girls.

The team investigates the case of a father, Greg Pritchard, and his young daughter who go missing on their way to school. When the team digs further into Greg's strange behavior, they discover nothing is what it seems with this seemingly perfect family man.

The team looks into the disappearance of a Saudi Arabian medical intern, Dr. Anwar Samir, who goes missing following a disagreement with his superior and the rejection of a marriage proposal by his girlfriend. When Martin begins to suspect Samir might have links to terrorism, Jack is forced to bring in the Joint Terrorist Task Force to investigate. But it quickly becomes apparent that Martin is more concerned with impressing his superiors than uncovering the truth.

Jack and the team search for a teenager who has gone missing from his foster home following a confrontation with a local bully, and whether the arrival of his wayward older brother had anything to do with his disappearance. Although all reports say he is a good, hard-working kid, the team begins to suspect some sort of gang problem.

Abby Buckman, an assistant district attorney's infant daughter, is snatched from a park while playing with another child. Initial evidence lays suspicion on those closest to the parents, but a ransom demand makes Jack realize the team is focusing on the wrong aspect of the case.

Jack and the team search for a businessman Patrick Kent, who disappeared shortly before he was scheduled to take a routine business flight, and discover that not only had he been leading a double life, but was also under surveillance by a private investigator.

Jack and the team search for missing boarding-school pupil, Andy Deaver. Over the course of their investigation, the team discover evidence suggesting the headmaster of the school has been showing an unhealthy interest in some of his male pupils.

The team is tasked with finding an aspiring model who changes her appearance regularly and has been missing for over a week without anybody noticing, while Jack is haunted by an old case he was unable to solve.

Jack and the team are called in to find a woman who appears to have been kidnapped by a car thief, but as they interview witnesses they begin to realize the case is more sinister than a random abduction.

The team searches for a boy who has vanished en route to his 11th birthday celebration and was last seen getting on a subway train. By the time the police get involved 16 hours later, a successful recovery starts to look unlikely.

A young successful marketing executive goes missing. Although her life seems full of happiness and achievement on the outside, the team discover she is actually living a sad and lonely life full of drugs, family issues, and failed relationships. Martin has a serious lapse in judgment on his first day on the job.