New York-based Opus Dei is portrayed as a secretive Roman Catholic organization in the book by author Dan Brown and movie set for release in May, in which fictional assassin Silas is an Opus Dei monk.
Opus Dei has embarked on a campaign to improve its image that includes its own blog written by a priest in Rome, The New York Times reported.
It also has introduced the only "real" Silas in Opus Dei -- a Nigerian-born New York stockbroker.
Opus Dei has found a silver lining in the controversy.
Doubleday is about to release "The Way," a collection of spiritual writings by Josemaria Escriva, the Spanish priest who founded Opus Dei in 1928.
"The Da Vinci Code" opened the door for "The Way," an Opus Dei spokesman told the newspaper.