What is the author's style in The Physicists by Friedrich Durrenmatt?

The Physicists keeps its focus on the single drawing room of the villa of Les Cerisiers. The play opens with a second murder at the villa having been already committed in the room. The action revolves around the events taking place in the drawing room. This creates a sense of claustrophobia that ties in neatly with the idea of the sanatorium as a sort of prison.