Amid recent debates over several publishers’ removal of potentially offensive material from the work of popular 20th-century authors — including Roald Dahl, R.L. Stine and Agatha Christie — is a less discussed but no less thorny question about the method of the revisions. For some e-book owners, the changes appeared as if made by a book thief in the night: quietly and with no clear evidence of a disturbance.
