A Victorian melodrama that was actually written in 1938 and has been filmed twice doesn’t necessarily sound like the most obvious play for a revival, But Gaslight is absolutely riviting, with excellent performances from the three leads, and a story that twists and turns and grips right from the very start. The action takes place over the course of one night, in the year 1871, with all events focusing on the drawing room in the home of Bella and Jack Manningham. What seems like a happy marriage is very soon shown to be anything but, as Bella is unveiled as a woman most definitely on the edge of madness, a…