Director Steve H. Broadmax III keeps the action bubbling, the parallel story lines clear and swift. Set designer Riccardo Hernández even manages to endow the boxy Martinson stage with a bit of mystery and depth. Partway through, a pentimento emerges from a splotchy, black-and-white background wash of … what? Foliage? Dirt? Blood? The story of Sally and Tom will haunt you – as it should.