An epic novel by Stephen King which is a true masterpiece, albeit bizarre as hell, about four psychically enabled childhood friends, who are receive their power from a remarkable Down Synrdome's kid named Duddits. However, during their annual hunting trip, they encounter a disoriented man who was separated from his group. The man, however, is bringing something with him, and the friends are launched into an epic struggle with an alien race. On the other side of the story is an insane militia leader and his protege, and the deadly lengths he'll go to in order to prevent the aliens from spreading. These two sides of the story become intertwangled, leading back to the secret of how the friends they got the way they are, their special fifth friend, their "dreamcatcher".
Stephen King wrote this novel entirely by hand after being struck down by a car in 1999, because he couldn't sit as his word processor, but he needed to write something because he needed the recreation to ease the pain he was in.
It was fixed into novel form and publsished in 2001, and had a fantastic film adaption in 2003, which starred Morgan Freeman, Thomas Jane, Donnie Wahlberg and Jason Lee.
Also, it's worth noting that it's been thrown out that Dreamcatcher takes place in the same universe as Stephen King's 'It'. Read it, you'll see.
Dreamcatcher is a novel by Stephen King that a lot of older fans didn't care for, and some even found to be less classier than his earlier work. Mainly because of the monsters known as 'shit-weasels'.
But it's still an incredibly worthy read, and an excellent film.