The Royal Court Theatre's continuing mission to unsettle its complacent audience continues with Max Frisch's absurdist parable about the passive complicity of the liberal middle class in the rise of Nazism. The respectable businessman Biedermann happily gives shelter to a pair of houseguests, and continues to give them the benefit of the doubt even when it becomes extravagantly obvious that they are the arsonists who are slowly destroying their town. It's a play which will have uncomfortable resonances for many left-wing Royal Court regulars, with comparisons to home-grown terrorism hard to avoid. Ramin Gray directs a cast including Benedict Cumberbatch and Jasper Britten.