Quartet is a brutal 75-minute piece for two. Marquise de Merteuil and the Vicomte de Valmont engage in an escalating series of role plays in a war for love, sex and power. Heiner Müller's reduced 1980 play adapts Dangerous Liaisons, the classic 1782 French novel that exposed the decadence of pre-revolutionary France, and that was turned into multiple movies and TV series.