The basic setup is this: You murdered someone, in locked-room detective story-like fashion, and the detective has shown up to investigate. He's asking everyone their stories. If you catches you out in an inconsistency -- or if you somehow permit everyone else to establish a clear alibi -- you're screwed.YouDunnit
The actual gameplay involves a series of "levels" that are a hour in the past, two hours in the past, three hours in the past, and so on. If you do anything in a level that "violates causality," you are "caught in a lie." Thus, for example, if you give someone a cat in hour -1, and fail to pick up the cat in a previous hour, you lose. You have to keep track of the events that occur, and make sure things remain consistent.
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.