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

An icy ending seems less likely as new details surface.

Back in Cordova, the search party buzzes Bob.

A critical clue leads to an island in Alaska.

The team lands in Alaska and gets to work.

One man who heard the bizarre broadcast is alive.

Through two photos, Jon untangles a mafia web.

Jon and Paul crisscross the desert, chasing clues.

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

A cabbie kills a key player, and investigators dither.

A shocking story, as told to investigators in 1994.

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

The pilot’s account of a previous Arctic crash.

A mysterious assassination letter surfaces.

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

Two congressmen vanish in Alaska in 1972.

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?