Advertisers seem to be getting better and better each year. Take, for instance, the trailer for “Switchback.””The hunter is tracking the killer,” says the eerie voice-over. “But the killer is setting the trap.”You’d think you were in for a great suspense-thriller. On the contrary, “Switchback” fails to deliver.Dennis Quaid stars as FBI agent Frank LaCrosse. Frank comes off like a man who’s a few fries short of a Happy Meal ‹ and he’s supposed to be the hero. Of course, the fact that his only son has been kidnapped by a serial killer gives him a good reason to be.Enter Danny Glover as serial killer and former railway worker Bob Goodall. Thanks to Glover’s spectacular performance, Bob is an extremely likable character, despite his serial killer status.One of the few credible features of this film is that the audience does not realize Bob is the killer until about half-way through the movie. In that time, Glover works his magic, charming the audience with his trustworthy smile and back-country drawl. He is, perhaps, the only character with a sense of humor. In a sea of straight-faced busybodies that take themselves way too seriously, Bob is a godsend, albeit a menacing one. The movie opens with the kidnapping of Frank’s son, Andy. It then cuts to a double murder in the remote town of Amarillo, Texas. Sheriff Buck Olmstead (R. Lee Ermey, “The Frighteners” and “Mississippi Burning”) of Amarillo is in the midst of an election and this seemingly unsolvable murder is the last thing he needs. The plot thickens and the movie cuts to Lane Dixon (Jared Leto of “My So-Called Life” fame). Hitchhiking cross-country, Lane is picked up by good ol’ Bob. As Bob chatters away at the secretive Lane, they become an odd couple of sorts. The audience has no clue what either of them has to do with the plot.Cut back to Amarillo, where Frank the Fruitcake makes his appearance. Quaid, who is normally a fine actor, seems a bit out of place in this role; it’s as if he’s trying way too hard to portray this very solemn, mysterious man. Sadly, he succeeds only at being ridiculously over-dramatic. By the time Frank finally opens up to Sheriff Olmstead about his past, the audience, if they’re still awake, no longer cares.At a whopping 131 minutes, “Switchback” gets off to a slow start that just never seems to pick up.