The scariest thing about the Timber Lake Playhouse's world-premiere production of Dracula is the set, and I mean that as a compliment. Designed by Joseph C. Heitman, the industrial playing space includes a series of metallic walkways with perilous inclines, some 20 feet above the floor, and the walkways themselves are slightly askew. The best way I can describe Dracula's architecture is by saying that, if the set were an amusement-park attraction, you'd be both ecstatic and petrified about riding it.