An alleged plot description for the next Indiana Jones movie has been revealed.

The untitled adventure film will reportedly be Harrison Ford's last in the series and also see Shia LaBeouf return as the archaeologist's son Mutt Williams.

An insider allegedly told New Zealand website Stuff that George Lucas and Steven Spielberg have been "working on a script and it's almost there" for Indiana Jones V. The story is said to involve the Bermuda Triangle, a location over the North Atlantic Ocean where aircraft have vanished under mysterious circumstances.

The source said: "Harrison is on stand-by for filming next year. This looks like being an emotional and exciting conclusion to the franchise, with Indy facing his biggest challenge yet.

"Shia LaBeouf has a central role again as Indy's son but this will be a blockbuster made in the old fashioned way rather than the CGI efforts of the last movie."

2008's Indiana Jones And The Kingdom Of The Crystal Skull grossed more than $780m (Â£540m) at the worldwide box office, but received mixed reviews from critics and fans of the series.

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