Murder Mystery is self-consciously disposable, like a motion picture designed to self-destruct in your mind seconds immediately after viewing, but the Agatha Christie for goofballs script, published by Zodiac screenwriter James Vanderbilt, is nimble more than enough to keep you from nodding off. Helvetica isn't going to give consumers lids with their to-go cups, and people preserve coming more than to Ray's to steal lids.