The IMDb trivia section is correct in pointing out that despite being a far-fetched plot, the story is essentially true. However, I researched the story a bit and found that although it was based on the sinking of the SS Morro Castle, the exact reason why the ship sank was never established beyond question. The ending of "The World Was His Jury" is fiction...pure fiction. Still, it's a dandy courtroom drama.
The story begins on the seas. The ship's captain has just died and his First Officer is now in command as the ship heads back to the States. However, soon the ship catches fire and panic ensues--and 127 people are killed. Soon, the media goes crazy--declaring that the accident is the fault of this new captain. In essence, he was tried and convicted by the media. However, despite this sensational climate, a lawyer (Edmond O'Brien) is excited to take the case and prove that the man was not criminally responsible.
The film is one that some might not like because it's very much confined to the courtroom. It does leave on occasion but is still a bit claustrophobic--and people who don't want a cerebral drama probably shouldn't watch. However, the script, while fictionalized, is terrific and Edmond O'Brien is at his best. Overall, great entertainment and well worth seeing. And the ending might be made up, but it's a dandy.