Watch the two-hour special, "Riddle: The Search for James R. Hoffa," on Fox Nation. Fox Nation is a streaming subscription service you can access from your phone, computer and select TV devices. We've created a members-only destination for Fox News' most passionate and loyal fans featuring exclusive content, exclusive experiences and exclusive access.

In this episode you'll hear from Dan Moldea, perhaps the nation's most prominent Hoffa expert. He started reporting on the teamsters, and Hoffa, in his early twenties. He was beaten up in the process... and in 1978 wrote the landmark book, "The Hoffa Wars: Teamsters, Rebels, Politicans and the Mob."

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Watch the two-hour special, "Riddle: The Search for James R. Hoffa," on Fox Nation. Fox Nation is a streaming subscription service you can access from your phone, computer and select TV devices. We've created a members-only destination for Fox News' most passionate and loyal fans featuring exclusive content, exclusive experiences and exclusive access.

In this episode you'll hear from Matt Birkbeck, an award-winning investigative journalist and author, who was a reporter for The Morning Call in northeastern Pennsylvania, which gave him a ring-side seat to the Bufalino crime family. He wrote the book about its boss, called "The Quiet Don: The Untold Story of Mafia Kingpin Russell Bufalino."

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Watch the two-hour special, "Riddle: The Search for James R. Hoffa," on Fox Nation. Fox Nation is a streaming subscription service you can access from your phone, computer and select TV devices. We've created a members-only destination for Fox News' most passionate and loyal fans featuring exclusive content, exclusive experiences and exclusive access.

In this episode you'll hear from Melvin Gudknecht, a former special agent in the intelligence division of the IRS. Gudknecht was part of the prosecution team that put Frank Sheeran in federal prison, and believe it or not says Sheeran, despite being an admitted mafia hitman, was one of the most honorable people he ever met.

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Watch the two-hour special, "Riddle: The Search for James R. Hoffa," on Fox Nation. Fox Nation is a streaming subscription service you can access from your phone, computer and select TV devices. We've created a members-only destination for Fox News' most passionate and loyal fans featuring exclusive content, exclusive experiences and exclusive access.

In this episode you'll hear from Father Jonathan Morris, long time Fox News contributor and good friend. He is the pastor of Our Lady of Carmel Church in the Bronx, New York and is also a best-selling author. Father Jonathan knows Frank Sheeran's story very well. He play's Frank's priest in the Netflix film, "The Irishman," Martin Scorsese's opus starring Robert de Niro as Frank, which tells the story of Frank's claims and what brought him to confess that he killed Jimmy Hoffa.

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Watch the two-hour special, "Riddle: The Search for James R. Hoffa," on Fox Nation. Fox Nation is a streaming subscription service you can access from your phone, computer and select TV devices. We've created a members-only destination for Fox News' most passionate and loyal fans featuring exclusive content, exclusive experiences and exclusive access.

In this episode you'll hear from Jeff Hansen, a former law enforcement officer in Michigan, who spent years investigating what happened to Jimmy Hoffa. Jeff says Hoffa was cremated at a crematorium very close to the house in Detroit. The only crematorium he says was operating there in 1975. His book is "Digging for the Truth: The Final Resting Place of Jimmy Hoffa."

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