Director John Curran made two perhaps inadvertently telling comments to the Toronto Film Festival audience last month following a screening of Stone. He said when Edward Norton first read the script, he passed on playing the title character because he (Norton) "just didn't see it." Later, after Robert De Niro agreed to play the title role, Norton reconsidered. Also, Curran mentioned that the film's near constant use of Christian talk-back radio as part of the soundtrack was a late addition because the director felt that De Niro is a very closed actor who didn't reveal much about his character's internal mental or emotional landscape, and Curran couldn't find music that would cue the audience into what Jack (De Niro's character) was thinking and feeling.
The line between subtle and muddled is a particularly thin one, and the film's defenders might think I'm on the wrong side of it. C. S. Lewis once opined that rhetorical nonsense doesn't become sense just by inserting the word "God" into a sentence. Likewise, just because Stone is asking questions that are essentially "religious" doesn't necessarily transform a muddled movie into something insightful. Sometimes it just results in muddled ideas about spiritual subjects.
De Niro plays Jack Mabry, a parole instructor on the verge of retirement who once responded to his wife's threat to leave him by responding with a threat of his own—he'd kill their child if she ever tried to leave, or ever mention it again. It's unclear whether Curran intended to portray Jack as a Christian, though he's certainly shown as a church attender. If Christian faith is central to Jack's character, it's not evident in the film.
Norton plays Gerald "Stone" Creeson, one of the last inmates for whom Jack will have to write a report recommending for or against parole. Perhaps sensing a core of sexual frustration or perhaps just fishing for some sort of blackmail leverage, Stone encourages his wife, Lucetta (Milla Jovovich), to contact Jack outside of the prison and see if there's anything—including seduction—she might do to help Stone's chances at parole. While Jack is dealing with his own temptations and failings, Stone begins reading and parroting information about an alternative religion that claims focusing on small sounds is the first step toward becoming God's tuning forks. (Curran has said that he made up the "religion" for the film.)
De Niro's acting credentials are unimpeachable, but the film seems to rely more on his persona than on his performance. None of the actors are bad, really, and Jovovich does probably her best work ever, but they don't seem to be in synch with each other or the script. You can have three great musicians, but if each of them and their conductor has a different piece of music the result isn't generally harmonious. It is one thing to keep the audience in suspense because we don't know which way a conflicted character is going to go; it is quite another to keep the audience in suspense by giving it conflicting sketches of who the characters are. Lucetta is a bit of a cipher—she has to cycle through multiple personalities to find what will push Jack's buttons, and so we get a sense of the game she is playing but no real sense of the woman who is playing it. Jack's wife will chastise him in one scene for using the Lord's name in vain—and then spout New Age babble about how we are all descended from rocks in the next. Jack himself is supposed to be a smoldering cauldron of anger capable of anything, but his demeanor is more sullen and defeated than lively or feisty.