The identity of Jack the Ripper is the greatest mystery in the history of British crime. For three decades, Swedish journalist Christer Holmgren has sifted through over 120 years of clues, searching for evidence that will unravel the case and reveal the true killer. He believes he's finally found his man, and he's off to London to prove it. Holmgren and a team of historians, detectives, and forensic pathologists revisit crime scenes and examine a series of eerie coincidences that tie six extraordinary murders to one ordinary man.

The World Trade Center towers were once the tallest buildings in the world, marvels of engineering and architecture. But on 9/11, within two hours of being hit by a terrorist attack, they collapsed. The official report has left many questions unanswered and spawned countless conspiracy theories. But two scientists, working independently, have come up with the same new theory, based on missing evidence, which may finally explain what happened on that tragic morning.

Something strange is happening in the Sierra Nevada skies. Over several decades, an estimated 2,000 aviation incidents have occurred there, with death tolls and disappearances far outnumbering those of the Bermuda Triangle. Why have so many pilots lost their lives or simply vanished without a trace? The phenomenon is explored on the ground and in the air, in hot deserts, cold mountains, high-tech labs, and even the outskirts of Area 51, all in search of the deadly truth of the Nevada Triangle.

Is a strange primate, standing 10 feet tall and weighing in at a thousand pounds, roaming the dense forests of the Pacific Northwest? For over 50 years, countless eyewitnesses claim to have seen the creature we've dubbed Bigfoot, and enthusiasts have collected footprints that do not match any bipedal species known to us. So who, or what, is this mythic creature? Scientists examine the facts, use rigorous analysis, and pull together missing evidence to find the truth behind the hairy legend.

Is believing in the Loch Ness Monster's existence really so outlandish? Kangaroos, giant squids, and even tigers were once considered mythical creatures. And a fish thought to be extinct for 65 million years was caught off the South African coast in 1938. It's possible something foreign to us could be hiding in the Scottish lake's cold depths, but is it probable? A detailed study exposes the truth behind the phenomenon, and investigates 80 years of photographs, videos, and thousands of eyewitness accounts.