Dreamcatcher   by Stephen King

"Dreamcatcher" is a novel written by Stephen King, published in 2001. The novel follows the events in the lives of four lifelong boyhood friends. They are forever changed after saving a boy with Down Syndrome from being beaten up by bullies.

"You grew up, became a man, had to adjust to taking less than you hoped for; you discovered the dream-machine had a big OUT OF ORDER sign on it."
Stephen King ~ Dreamcatcher

The boys start sharing psychic abilities and are able to communicate with one another telepathically, and share dreams. The boys remain friends into adulthood and are on their annual hunting trip, when they are faced with the unimaginable...