In the latest chapter to one of the most successful sci-fi thrillers of the last decade, a new group of unwilling participants frantically moves through an ominous construct of cubeshaped rooms. While some rooms provide momentary solace, others offer hideously inventive and painful death. On the outside, a young man charged with watching over the cube is beginning to understand that there's more going on than he's been told. In order for all of them to survive, they are going to have to trust each other in navigating through this complex killing machine.