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Richard Berry originally wanted to hire James Newton Howard to compose the film's music, but eventually set his sights on Klaus Badelt after he was advised to listen to the music he composed for Anything for Her (2008). After meeting with Badelt and showing him the film when he learned the composer was in Paris, Berry was pleasantly surprised to hear him say that it was him who was asking to score the movie, not the other way around.
Both the film and the book it's adapted from are loosely based on a seventies gang war between Jacques Imbert aka "Jacky Le Mat" (considered to be the last "Don" of Marseille) and Tany Zampa. Just like Charly Matteï in the film, Jacky was left for dead on a parking lot with 22 bullets in his body by Zampa, yet miraculously survived with only his right arm remaining paralyzed.
Debuted at the number three spot on the French box-office, under the newly released Alice in Wonderland (2010) and French romantic comedy Heartbreaker (2010) in its second week.
Filming lasted 14 weeks.