The director, who has brought Bret Easton Ellis's novel to Broadway, explains why he's drawn to the dark stories of Patrick Bateman, Faustus and Macbeth"I am drawn to theatre as an art form of surprise and of provocation," says the Almeida's artistic director Rupert Goold, while backstage at rehearsals for American Psycho, the stage adaptation of Bret Easton Ellis's novel about late 80s excess and violence in New Yor…