What I’ve always wanted to know is why, if the dead can communicate with us at all, do they rely on such chancy methods asseances and table-turning, or Ouija boards, or fleeting appearances in diaphanous form in out-of-the-way places? Or, as in “White Noise,” Geoffrey Sax’s new movie starring Michael Keaton, barely decipherable images in the “snow” on untuned televisions and barely decipherable voices emerging from the static on unoccupied portions of the FM radio spectrum?

There is a certain class of people to whom this movie is designed to appeal, who suppose that science will eventually allow us to capture and confine God and the mysteries of the supernatural, as we have already captured and confined nature, at least to a considerable extent. But if ghosts and other heavenly creatures are really going high-tech with what this movie calls EVP – Electronic Voice Phenomenon – and insists is real, why don’t they show up in living color and on HDTV? It seems unlikely, somehow, that in the age of cable and satellite television, the eternal’s technical know-how should not yet have progressed beyond the rabbit-ear stage.

But put this objection aside for a moment. The shyness of ghosts is by now well-established in the iconography of the phenomenon, and ghost stories nearly all depend on it. In fact, that’s the great thing about ghost stories as opposed to, say, a whodunnit: You don’t have to explain the mystery.

Certainly neither Mr. Sax nor his screenwriter, Niall Johnson, thinks it worth their trouble to offer even an implausible explanation for the phenomena they describe in terms of either physics or metaphysics. The trouble is that they try to combine their ghost story with a whodunnit and end up not explaining either one, taking the license provided by the former to remain equally mysterious about the latter.

Mr. Keaton plays Jonathan Rivers, a successful architect married to a successful novelist, Anna (Chandra West), but with a small son, Mikey (Nicholas Elia) from an earlier marriage to Jane (Sarah Strange). One fine day, just after she tells Jonathan she is pregnant, Anna disappears. A strange, obese Briton called Raymond Price (Ian McNeice) tells him that Anna is dead and that he has been receiving messages from her – among other dead people – on his high-tech audio-visual equipment.

At first, Jonathan reacts as most of us would, with anger and annoyance, but after Anna’s body is discovered – she apparently drowned after slipping on some rocks and hitting her head while she was trying to change a flat tire by a river – he re-establishes contact with Price and becomes, like him, a hi-fi buff with an obsession about watching and listening to the dead on television.

Fair enough. But Anna, unlike the other ghosts, appears also to be gifted with powers of clairvoyance, and she sends her widower hareing about the countryside to rescue people in dire peril. One of them is a woman who has been kidnapped, and the question is raised as to whether or not she herself was kidnapped and murdered instead of having been merely the victim of an accident.

Raised, but not answered, that is. Though we have been introduced to the kidnapper once before, our acquaintance is so slight that he might as well be a random person, and all that we know about him is that he is yet another techie with banks of receiving equipment and computers and video monitors who thinks that, in torturing women, he is pleasing a bunch of bad ghosts.

For one of the ghostly mysteries the film doesn’t bother to explain is why some ghosts only want to say reassuring things to their loved ones while others want to help people in distress – and how do they decide which people to help? – and still others say insulting and profane things in scary voices about the people who try to reach them and can even escape from the television to kill them or do them serious physical harm.

And if they can do that, why do they need the assistance of a human agent like the kidnapper in wreaking mayhem? Do they also have a sexual motive, as it is hinted he does? In the film’s climactic scene, our hero’s tangle with the ghostly emanations of these evil spirits is as mystifying as his wife’s disappearance in its opening.

Actually, more unbelievable than the ghosts is the fact that Jane, the ex-wife, remains both affectionate and understanding about Jonathan’s manic attempts to reach across to “the other side” to contact her replacement.

Mikey, unusually well-behaved for a movie child, has little to say about it all, and seems quite happy to pass the time while his dad is trying to reach his step-mom in heaven watching “Caspar the Friendly Ghost” on his own television.

Madame Du Deffand famously said of the legend of the six-mile hike of the martyred St. Denys with his severed head under his arm, that it’s only the first step that counts.

So, too, you’d think it enough of a wonder that Anna and the other ghosts have got their own television show, but this isn’t enough for Messrs. Sax and Johnson. They must make their ghosts also clairvoyants, or sex criminals, and then leave the explanations for such extraordinary qualities to the general mystery of their ghostliness. This is typical Hollywood overkill, and the profusion of extraordinary events is likely to prove too confusing to audiences for this to be Mr. Keaton’s first hit movie in nearly a decade.