In July Batman: Under the Red Hood will replay the Death in the Family story from 1980's Batman comic in which an unpopular Robin (Jason Todd) was voted to death by fans calling into a 1-900 number. Not sure how the rest of this movie will be a "mystery" but in any case years later someone calling himself the Red Hood arrives in Gotham seeking vengeance. Should be a good time. Here is a sneak peek at the movie. Watch it while it lasts on youtube.