Gillian Slovo’s play about Guantánamo detainees was controversial in London – so how would it play in New York? “For a novelist who has not previously written for the theatre, New York did seem rather unbelievable, and, it has to be confessed, not a little frightening. This is a play, after all, that centres on British Asians or British Islamic converts, people who had all got caught up in the events that followed the obliteration of the Twin Towers. How would Americans deal with it?”