Organizers of the third annual Boston Book Festival are distributing 30,000 copies of their 2011 “One City, One Story” selection, The Whore’s Child by Pulitzer Prize winner Richard Russo. In the short story an elderly nun, the abandoned daughter of a prostitute, writes about her childhood in a convent. A panel of librarians, educators, and writers selected the work for its literary merit and ability to stimulate discussion.