French minimajor Gaumont is developing “Antitrust,” a psychological thriller penned by American novelist Douglas Kennedy.

Kennedy’s first screenplay centers on conflict between two brothers who are drastically different: One is a successful financier and the other is a painter. Pic follows the journey of the wife of one of the brothers.

Kennedy is writing the English-lingo pic and will deliver the script in fall.

The film will be produced and distributed in France by Gaumont, who will also handle international sales.

Kennedy’s “The Big Picture” was adapted in French for the bigscreen by Eric Lartigau. Called “L’Homme qui voulait vivre sa vie,” it grossed approximately $10 million.