Should he criminally collude, thinking only of his own survival and role in his separatist Hasidic sect? Or does he owe allegiance to the world beyond and to his Puerto Rican assistant who wants the gangster shopped to the police? Despite irritating black-outs between scenes, which interrupt the flow of this tense, taut conflict, Gordon Greenberg's production engrosses. The characterisation is sometimes flimsily stereotyped and the denouement sentimental, but Rattner provocatively reveals New York as a city of immigrant outsiders, all immersed in their own closed worlds - Hasidic Jewish, Puerto Rican and Cuban. George Layton's fraught Aaron, Owen Oakeshott as his Puerto Rican assistant, Michelle Gomez as a moll with heart and especially Mario Kalli's gangster with a killing air about him keep you rapt.