Zapa is a locksmith in a remote and quiet little town, lost somewhere deep in the province of Buenos Aires. After getting involved in a crime, his uncle, a retired policeman, bails him out and gets him a spot to join the Provincial Police as an aspiring officer in the thick urban sprawl of Greater Buenos Aires' West Zone. Soon he will get involved in a new type of corruption.

In Argentina, between 1982 and 1985, the Puccios, a well-established family of San Isidro, an upper-class suburb of Buenos Aires, kidnap several people and hold them as hostages for a ransom.