The Enterprise answers a distress call from the Ventaxians, whose world is besieged by its own panic because the terms for a legendary millennium-ago deal with the devil is set to expire — like today. According to said legend, the devil, Ardra, will return to enslave the world (after having so benevolently granted it 1,000 years of peace). Ardra (Marta Dubois) does indeed appear and lay claim to the world, demonstrating powers that would seem magical if this weren't, you know, Star Trek, where technology can do anything. In response to Ardra's parlor tricks, spineless Ventaxian bureaucrat Jared (Marcelo Tubert) is prepared to hand over the keys to the planet.
Not if Picard has anything to say about it. Picard doesn't believe Ardra is really the devil because Picard, you know, has an IQ over 80, which apparently can't be said of any of the Ventaxians. (Is this someone's twisted allegory for the Second Coming? Naturally, any references to human religions are absent.) The Enterprise crew embarks on an investigation to debunk Ardra's assertion and her claim to the planet. Meanwhile, Ardra also lays claim to the Enterprise, since it's in orbit. This is clearly overreaching, because if there's one thing you don't screw with, it's the USS Enterprise.
"Devil's Due" is, in a word, weak. Or in two words, really weak. The plot is a true who-cares scenario: Who cares if the Ventaxians are exploited? (Frankly, given their stupidity, they deserve it.) And who cares about all the contrived tech details of investigating Ardra? And who cares about this woman lusting after Picard? And who cares if the Enterprise disappears (which plays like lame unintended comedy)? The narrative is a choppy exercise in tedium, revealing its utter desperation by finally just becoming a courtroom episode where Data is the judge. Picard turns the tables in utterly predictable fashion, leading to a boring payoff where Ardra is exposed as the con woman she is. I have my doubts that any combination of Neat-O Technology could so perfectly perform the illusions we get in this episode, or if they could, that anyone (okay, maybe Jared, but that's the problem) would be fooled into thinking they're supernatural in origin.