As they walk in the wilderness outside their cabin, Jack becomes alarmed by a trail of footprints in the snow and pulls Ingrid towards shelter.

Jack becomes nervous, and disposing of the cell phone that Pavel gave him, goes to nearby Castel del Monte instead, where he now uses the name Edward.

In the meantime, Jack suspects that he's being followed by a man, but he still meets with Mathilde in a secluded area next to a river to test the weapon.

She is impressed by the craftsmanship, but asks Jack to make a few more adjustments to the rifle, and to provide her with specific types of ammunition before they complete their transaction.

Finally, Jack agrees to deliver the completed weapon and ammunition to Mathilde as his last job, but at the last moment, he re-opens the briefcase holding it.

Seeing Mathilde fall from the roof, Jack gives Clara the envelope of cash and tells her to wait for him at the river where they had picnicked before.

Filming began in September 2009 and took place in Castel del Monte, Sulmona, Castelvecchio Calvisio, Calascio and Campo Imperatore in the Province of L'Aquila (Abruzzo); in Rome, and in Östersund, Jämtland and other locations.

The comic-acting waiter in this restaurant scene was directed to stand in front of a two-bulb lamp fixture so that he appeared to have "devil's horns".

[5] The film score was written and composed by German singer-songwriter (and longtime friend of Corbijn) Herbert Grönemeyer.

A 1967 song called "Window of My Eyes" by the Dutch blues band Cuby + Blizzards is played over the ending credits.

The aria "Un bel dì, vedremo" ("One fine day we'll see") from Puccini's opera Madama Butterfly can be heard in the background of one scene, and "Tu vuò fà l'americano" in another.

Once Upon a Time in the West (1968), with Henry Fonda facing off as a villain in a gunfight, is playing on television on the back wall of a modest restaurant where Jack has been eating.

Corbijn also notes the Ennio Morricone scores made famous in Once Upon a Time in the West, The Good, the Bad and the Ugly (1966), and other films.

"[13] Leonard Maltin called it a "slowly paced, European-style mood piece, short on dialogue and action and long on atmosphere".