Four childhood friends discover a box of strange books that, when read aloud, can transport them to the beautiful, imaginary worlds described within. But when one of them goes missing, the others vow never to reveal where they've been and what they've seen. Years later, when one of the remaining kids, now an adult, also mysteriously disappears, it's up to the last two of the group to dig up their dusty books to find him and finally figure out what happened to their friend all those years ago.