Roman Polanski Roman Polanski

Roman Polanski is finishing his new film, The Ghost, from his Swiss jail cell, according to screenwriter Robert Harris.

"He can make his wishes known from his cell. I don't think he can make phone calls, but he can communicate," Harris told The Times. "What people think of the film is another matter. Whether the film can rise above the circumstances in which the director now finds himself, I don't know. We will test to the upper limits the notion that there's no such thing as bad publicity."

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Harris, who also wrote the book on which the film is based, said the 76-year-old director wants to complete the film in time for its scheduled premiere at the Berlin Film Festival in February. Among Polanski's orders were instructions to composer Alexandre Desplat about the movie's score.The Oscar winner finished editing The Ghost

, starring Pierce Brosnan as a British prime minister accused of war crimes, on the day of his arrest last month, Harris said.Polanski is wanted by U.S. authorities for having sex with a 13-year-old girl in 1977. He fled the United States in 1978 after pleading guilty to one count of unlawful sexual intercourse with the girl.

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Polanski was denied release last week, but his lawyers are currently challenging extradition."It is a nightmare looming that the director might be in jail at the time [of the film's release], but we will just have to cope with this as the situation develops," Harris said. "I'm sure he would want the film to go ahead, having worked on it for two years."