Juan plans to introduce his girlfriend Casilda during the weekend at the family home in the mountains. However, before arriving, Juan and his brother Santiago have to flee from a group of assassins who are chasing them by mistake. The killers belong to a criminal organization that includes Miki, who should never have been there, and Gus, a policeman infiltrated in the group who tries to take care of Miki. Meanwhile, Pinco, who should take Miki's place, enjoys the hospitality of the man in charge of the criminal organization, unaware of the problems that are coming their way.

"First rule: do not separate from your knife."