In 2001, Robert Fisher killed his family, blew up their suburban home, and vanished in a remote Arizona forest. Did he die — or escape?

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A young doctor disappears in New York City on the eve of 9/11.

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Jon and Paul crisscross the desert, chasing clues.

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“Dateline N.B.C.” commissions a secret report.

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A cabbie kills a key player, and investigators dither.

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A shocking story, as told to investigators in 1994.

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A mobster marries the widow of one of the missing men.

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The pilot’s account of a previous Arctic crash.

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A mysterious assassination letter surfaces.

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Battling snow and waves, searchers hunt for the missing plane.

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Two congressmen vanish in Alaska in 1972.

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Alaska, 1972. Two congressmen vanish on a small plane. They’re never found. In 1995, a mobster tells the F.B.I. the plane was bombed. What happened?

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A new account of the alleged bombing, via a serial killer.

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We locate the first known photos of N1812H.

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An icy ending seems less likely as new details surface.

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Back in Cordova, the search party buzzes Bob.

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A critical clue leads to an island in Alaska.

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The team lands in Alaska and gets to work.

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One man who heard the bizarre broadcast is alive.

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Through two photos, Jon untangles a mafia web.

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