Atonement: The Opera
The book, which was released in 2001, follows a love affair doomed by a child's misunderstanding.
Director Joe Wright's movie, also starring James McAvoy, landed seven Oscar nominations and won the Academy Award for Best Original Score.
Now writer McEwan is working on an operatic version with composer Michael Berkeley and poet Craig Raine - and he promises the finished show will be a grand affair.
He says, "It's not a chamber piece, that's for sure."
Theatre owners in the U.K. Germany and the U.S. are reportedly interested in staging the Atonement opera and are eyeing a 2013 premiere.
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