Two minutes into the second act, there is a knock on Nicolas Boehlmer’s dressing-room door, just as he’s smoking his last cigarette before having to go back on stage … and, without thinking, he says, Come in, still in character. He quickly finds himself bound, gagged, and stripped by a man who appears to be his mirror image: costumed in the same wig, make-up, and clothes. Nicolas is powerless to prevent his usurper from going out and playing his role-with increasingly ridiculous consequences. Is this upstaging the act of a depraved amateur? Sabotage by a rival? A piece of guerrilla theater? A political statement? Whatever the cause, Nicolas and his fellow actors soon find their play-and their lives-making less and less sense, as the parts they play come under assault by this irrational intruder.