Based on the novel by Mystic River author Dennis Lehane, Gone Baby Gone tells of two private detectives' attempt to find a young girl abducted in a rough part of Boston.

Pre-screening, Casey Affleck joked that brother Ben was 'a pain in the ass' as a director while the director himself chose Deauville as a premiere point because the festival 'seems to really care about movies.' Ben Affleck thanked the festival and the public, saying audience reaction determined whether he stayed or left his film's festival screening.

This year Deauville, which runs from 31 August to 9 September, honours Michael Douglas with opener King of California, Mike Cahill's comedy in which Douglas plays a mentally unstable father searching for Spanish gold in the suburbs.

Deauville's glitterati usually calms when competition starts but this year stars, fans and security keep coming. Wedged between Venice and Toronto festivals, Deauville attracted Mat Damon with The Bourne Ultimatum, Brad Pitt with partner Angelina Jolie for The Assassination of Jesse James by The Coward Robert Ford and George Clooney.

Recently made a Chevalier des Arts et Lettres by new culture minister Christine Albanel, Clooney arrived to support Tony Gilroy's directoral debut Michael Clayton.

Paul Haggis, who took Deauville in 2005 with Crash, also appeared to promote his Iraq war drama In The Valley of Elah.

Author Jay McInerney is to receive an award and an homage to Sidney Lumet begins with the world premiere of his Before The Devil Knows You're Dead.

Zoe Cassavettes and Gena Rowlands arrive supporting competition film Broken English while the Farrelly brothers launch The Heartbreak Kid.

Of product screened, Waitress by the late Adrienne Shelly and Weinstein Company's Grace Is Gone have been well received.

Awards are announced September 9.