On July 30, 1975, Jimmy Hoffa went to meet somebody in the parking lot of a suburban Detroit

restaurant and was never seen again.

Hoffa had once been one of the most powerful union bosses in the country.

The former leader of the teamsters and his disappearance and presumed murder prompted

a massive nationwide FBI investigation that lasted for decades and was never resolved.

Now a new book shed startling light on the case.

It was written by an author with the most improbable of windows into what may have happened.

Jack Goldsmith, a Harvard Law School professor and former top justice department official,

whose stepfather was for years the FBI's chief suspect in the case.

Hoffa's longtime right-hand man, Chuck E. O'Brien.

Goldsmith's book is a sweeping story that encompasses Hoffa's rise to power,

his bitter feud with Bobby Kennedy and his ties to the mafia bosses across the country.

But most of all, it is a tale of Goldsmith's up-and-down relationship with O'Brien,

an enigmatic figure the author called Dad.

We'll talk to Goldsmith and explore the still lingering mysteries about Hoffa's disappearance

on this episode of Buried Treasure.

Because people have got to know whether or not they're present or so.

Well, I'm not a crook.

I told the American people I did not trade arms for hostage.

My heart and my best intentions still tell me that's true,

but the facts and the evidence tell me it is not.

I did not have sexual relations with that woman.

...