M.I.T. students have secretly built a time machine in an underground facility. They send one of their own, Jim, forward in time one hour to test it. But when Jim arrives one hour into the future he sees blood everywhere, dead bodies, they've all been murdered. So Jim reverses the machine and is sent back to the present - where he says to the others, I've got some bad news... Now they have an hour to try and figure out which one of them is the killer and stop what happened from happening.