The pitch must have sounded like a no-brainer: a teenage, suburban remake of Rear Window, updated with digital technology. This time the bored voyeuristic hero (Shia LaBeouf) who's spying on his suspicious neighbor (David Morse) is under monitored house arrest for slugging his Spanish teacher. And this did keep me alert for a while, thanks partly to Sarah Roemer (who has some of Cybill Shepherd's insolence) in the Grace Kelly part and Carrie-Anne Moss as the hero's hot mother. If you're happy to watch a thriller about a tenth as good as Alfred Hitchcock's, director D.J. Caruso and screenwriters Christopher B. Landon and Carl Ellsworth hold up their end of the deal, at least until the proceedings devolve into standard horror-movie effects and minimal motivations. But of course Hitchcock's original never had to resort to thunder and lightning to goose up the suspense. PG-13, 104 min.