R.P. Productions, the film company run by Roman Polanski, has confirmed to MovieScore Magazine that French composer Alexandre Desplat is doing the original score for Polanski’s new film, The Ghost. The film is currently in post-production, but it remains unclear if the film will be delayed or not as a result of the recent arrest of Polanski in Switzerland. According to various sources, Desplat is among the individuals who signed a petition organized by Société des Auteurs et Compositeurs Dramatiques to set the famous 76-year old director free (Polanski is imprisoned in Switzerland on a 31-year-old U.S. charge of child rape).

The Ghost is based on the Robert Harris novel about a ghostwriter who uncovers some deadly secrets when he’s writing the memoirs of a former British prime minister. The cast includes Ewan McGregor, Pierce Brosnan and Kim Cattrall.

Desplat is one of the busiest international film composers at the moment and is a hot name among auteur filmmakers: apart from Polanski, he’s writing music for Terrence Malick’s new film The Tree of Life and he recently worked for such esteemed directors as David Fincher (The Curious Case of Benjamin Button), Robert Guédiguian (The Army of Crime), Stephen Frears (Chéri) and Ang Lee (Lust, Caution). Among his other upcoming films are the animated The Fantastic Mr. Fox and the first Twilight sequel, The Twilight Saga: New Moon.