I saw this movie "RAPT" (2009) by Lucas Belvaux at COLCOA last year. It is loosely based on an actual event. Yvan Attal's performance is very convincing and the story is very intense as you think this incident really happened!
SYNOPSIS: Lucas Belvaux’s edge-of-your-seat thriller - inspired by the 1978 kidnapping of French industrialist Edouard-Jean Empain - features a career-defining performance by Yvan Attal (Munich, My Wife Is an Actress) as a millionaire playboy who is abducted and held for ransom for 60 days. (COLCOA)