In the middle of the night, intruders murder his parents and load him into an SUV. He will wake up in a room that looks just like his own, except there’s no window.
Outside his door are other kids with special talents. As he learns: "you check in, but you don’t check out."
A class of junior high school students is taken to a deserted island where, as part of a ruthless authoritarian program, they are provided arms and forced to kill one another until only one survivor is left standing.