While serving time in prison, an Argentinean gangster tries to unify the members of an Italian gang known as the "Mariachis" with the objective of making future robberies more fruitful then the past ones. To that end, he delegates authority to an Argentinean and a Mexican gang members who are outside for them to make the necessary contacts. By mistake, one of them contacts a musicians group instead, with unexpected results.—Artemis-9