On a white-water rafting trip, Declan is thrown from a raft and ends up miles downstream, badly hurt with a broken leg. Luck is on his side, however, as a kindly old man named Dr. Nader discovers him and takes him to Camp Sanopi, a secluded retreat deep in the woods. But Declan soon discovers that this blissful camp is not what it seems to be and that although all are welcome, none can leave.