Related by context. Frequent words. (Click for all words.) 58 mysteries 55 unexplained phenomena 53 unsolved mysteries 53 mystery 51 amateur sleuths 50 FBI profilers 49 whodunnit 49 unsolved murder 48 paranormal phenomena 48 enduring mysteries 48 UFO sighting 48 sleuth 47 dunnit 47 alien abductions 47 riddle 47 UFOs 46 Olivia Dunham 45 alien spacecraft 45 whodunit 45 mysterious 45 UFO 45 unsolved mystery 45 extra terrestrials 45 amateur sleuth 45 UFO sightings 45 enigmas 45 paranormal 45 whodunits 44 paranormal investigator 44 psychic abilities 44 X Files 44 suspense novels 44 super sleuth 43 spymasters 43 alien beings 43 astrobiologists 43 spies 43 urban legends 43 paradoxes 43 fictional characters 43 Unsolved Mysteries 43 hidden meanings 43 Le Carre 43 high temperature superconductivity 43 enduring fascination 42 Whodunit 42 sleuthing 42 unsolved 42 Sherlock Holmes 42 crystal skulls 42 Hercule Poirot 42 quantum physics 42 vampires werewolves 42 Loch Ness Monster 42 Lord Lucan 42 superspy 42 riddles 41 shape shifters 41 Mysteries 41 supernatural creatures 41 strange happenings 41 detective 41 extraterrestrials 41 fascinating 41 Miss Marple 41 serial killers 41 unsolved murders 40 hauntings 40 flying saucers 40 Dana Scully 40 Mona Lisa smile 40 debunker 40 unsolved crimes 40 spy thrillers 40 cosmologists 40 Scotland Yard detective 40 Skrull 40 spy 40 cryptographers 40 Jupiter moons 40 debunkers 40 sleuths 40 shapeshifter 40 FBI 40 Higgs Boson 40 gangland murders 39 grisly murders 39 Rosetta stone 39 detectives 39 ghostbusters 39 INVESTIGATORS 39 gumshoes 39 supernatural beings 39 Mona Lisa 39 alien abduction 39 gyroball 39 origins 39 paranormal activity 39 morbid fascination 39 shadowy 39 vampirism