What is the theme of the play heat lightning by r.f.carroll?

in this play a frightened young woman ,running from a killer on a dark and stormy night , thinks that she has found a save heaven in a bus station . The situation of the play is highly emotional right from the moment the curtain rises until it falls. there is terror from the outset , and there are all the components necessary to create a melodrama - a dimly-lit bus station , a storm accompanied by flashes of lightning , and a promise of violent action or emotion