The Zodiac Killer claims the lives of five known victims while taunting the police and the press from December 1968 to October 1969 in California.
Police follow leads in the disappearance of 3-year-old British girl Madeleine McCann from a resort town in Portugal.
A construction worker in Kansas falsely claims he needs to report for jury duty, leaves his job early and is never seen alive again.
John, Carla and Patrick go to Ohio to search for clues in the disappearance of a 25-year-old man.
The team investigates the unsolved ax murders of two adults and six children while they slept in a house in Villisca, Iowa, in 1912.
The grisly murders of two girls in 1999 continue to haunt Dothan, Ala.
Psychic profiler Carla Baron, medium John J Oliver and paranormal investigator Patrick Burns investigate the murders of two girls who were last seen alive getting into a blue truck at a convenience store in Arizona.
Student Natalee Holloway disappeared in Aruba while she was on holiday. Two years later, the team looks for new evidence that might reveal what really happened.
A woman discovers a dead body on the beach.
A lifeguard is kidnapped from her job in broad daylight.
Paranormal investigators help the police to determine how a young man died.
The only clues in the disappearance of a District Attorney are a Mini Cooper and a damaged laptop.
The team travels to Boulder, Colo., to investigate the unsolved murder of child beauty queen JonBenet Ramsey in 1996.
Missing college student Kristen Modafferi's trail stops at the water's edge in Land's End Park in the San Francisco Bay Area.
Investigators in Washington, D.C., search for links between the murders of Joyce Chiang and Chandra Levy, who both interned for congressmen, frequented the same Starbucks in DuPont Circle, and whose bodies were found in parks.
A popular high school teacher vanishes.
Investigators try to puzzle out what happened to a young woman who vanished after a celebratory dinner with her fiance and friends.
A Georgia law student is found in her burned-out apartment with all the doors locked.
The search for evidence in hikers' deaths.