Christof uncovers new clues about the true fate of Wild West outlaws Butch Cassidy and the Sundance Kid. He travels to the highlands of Bolivia and the mountains of Utah to dig up evidence that may finally solve this 100-year-old mystery.

Christof joins the decades-long hunt for the buried millions of notorious gangster Dutch Schultz. With rare documents, exclusive interviews and cutting-edge tech, Christof tracks the Prohibition-era mob boss to find his ill-gotten haul of cash, gold and jewels.

Christof digs into the most infamous -- and gruesome -- unsolved murder case in Los Angeles history. He uncovers an investigation derailed by corruption and finds a confession pointing him to a new suspect in the Philippines.

Christof tries to unmask the Axeman of New Orleans, a crazed murderer responsible for one of the deadliest unsolved killing sprees in American history. He uncovers a connection with organized crime and finds that this gruesome executioner may not have acted alone.

Christof heads to the woods of the UK and snowy fields of Canada to determine what the truth is behind UFO sightings. He soon uncovers a much bigger story behind what secrets the government is hiding.

Christof investigates the robbery of the Isabella Stewart Gardner Museum, the largest art heist in history. In pursuit of the stolen masterpieces, he follows leads from dangerous members of organized crime that take him from Boston to Florida and France.

Christof investigates the Lindbergh kidnapping, a story that made his grandfather's journalism career. Now, using his grandfather's notes and recently declassified FBI files, Christof tracks down surprising new leads to Germany and even the Nazi Party.

Christof jumps from a plane and digs up rare FBI files as he follows shocking new leads that take him from the Pacific Northwest to Las Vegas and Utah in his quest to find the real identity of hijacker D.B. Cooper.