Investigators from The Atlantic Paranormal Society (TAPS) join experienced Irish investigator Barry Fitzgerald as they travel around the world, using their principles of scientific techniques, to sniff out famous haunted spots in this entry in the "Ghost Hunters" reality-TV franchise. Among the global locations the "Ghost Hunters International" team visits are Chillingham Castle in England, the forgotten underground city of Mary King's Close in Scotland, Peru, Singapore, Sweden and the Philippines.