At one point in "Eagle Eye," the main characters finally give up and decide to go along with everything they're being told to do by the menacing voice that's on the other end of the telephone line.

It might not be a bad idea for audiences to do the same thing, for them to simply go along with what this paranoia thriller tells them to do and what they should believe.

Otherwise, they might find that this paranoia thriller is silly — if not downright implausible.

Depending on your perspective, it will be either one of the year's sillier films or one of its most enjoyable ones. Or possibly a combination of both.

Shia LaBeouf stars as Jerry Shaw, an underachieving 20-something who's still reeling from the recent death of his estranged twin brother, a U.S. Air Force officer.

He's also getting cell-phone calls from a mystery person giving him instructions — so he eludes capture by FBI agents and others who believe he's involved in terrorist activities.

Meanwhile, single mother Rachel Holloman (Michelle Monaghan) is apparently receiving calls from the same person. She's being told that if she doesn't aid Jerry in his assigned "tasks," her young son, Sam (Cameron Boyce), will be killed.

Separate subplots also involve a FBI agent (Billy Bob Thornton), a U.S. Air Force investigator (Rosario Dawson) and the U.S. Defense Secretary (Michael Chiklis).

Director D.J. Caruso ("Disturbia") and four credited screenwriters inject some strong science-fiction elements into the tale. And yes, that does mean there's an explanation for the all-seeing, all-knowing and seemingly all-powerful person/entity.

Again, that explanation stretches credibility and is a lot to swallow. Some of the machinations on TV's "24" seem logical by comparison to this film's plotting.

But the exciting action makes it easier to go down, as does the very good ensemble cast. (By the way, if the reports can be trusted, that's an uncredited Julianne Moore as the mystery voice.)

"Eagle Eye" is rated PG-13 for strong scenes of violent action (warfare, vehicular and explosive mayhem, shootings, violence against women and child-in-peril elements), occasional strong profanity (including one usage of the so-called "R-rated" curse word), crude and suggestive language and references (mostly slang), brief drug references and contents (injections), and derogatory language and slurs. Running time: 118 minutes.

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