The Corsican File (movie, 2004)

Jack Palmer is a Paris-based detective with a huge ego. Ange Leoni is a rebel native of Corsica whose location can't be pinned down by even the most dogged of detectives. Approached by an obscure, small-time attorney and charged with the seemingly simple task of locating the missing Leoni, gifted gumshoe Palmer accepts the job under the assumption that it will be the easiest money of his professional career. But this superstar sleuth is about to find out just how mistaken he was...