Years after serving together in the French Foreign Legion, American soldier of fortune Franz Propp (Charles Bronson) and French doctor Dino Barron (Alain Delon) are unexpectedly reunited under the most extraordinary circumstances. Hoping to help a friend who has embezzled some bonds, Barron tries to break into a safe in the dead of night. Sneaking into an underground vault he is surprised to discover that his old pal Propp is also on the premises, likewise intending to crack the safe, albeit for his own benefit. After a few awkward moments, a friendship develops between the two as they try to get out from the locked vault. A Franco-Italian co-production, Adieu L'Ami was released in the U.S. as Farewell, Friend and Honor Among Thieves.