When Mimi discovered an unconscious bag lady huddled behind a London cinema a sense of duty prompted her to call an ambulance. It was only later that she wondered if the tramp, who could have been anybody, might have been somebody after all. Could she be Leah, Mimi's abandoned and abandoning mother? Or perhaps she was Bella, a surgically reconstructed bomb-blast victim? Then again, she could have been the perverse and reclusive nun, gifted with terrible, miraculous powers . . .
