Is your identity really yours? What will happen to humanity when science surpasses our wildest imaginings? In Caryl Churchill's gripping new drama A Number, a man is confronted by three of his grown sons (all portrayed by the same actor) when they discover that they are replicates-human clones cut from identical genetic cloth with drastically differing results. As each son in turn seeks the truth behind his genesis, the surface calm is disrupted by unsettling questions concerning identity, individuality, and a brave new family's desperate attempt to negotiate a brave new era.