The films centers on the relationship between a Civil guard and his heroin addict son who falls in an escalating life of crime.

Withdrawal is too painful for Paco, who is under the watchful eye of his severe but concerned widower father, Evaristo Torrecuadrada, a civil guard commandant.

While Paco begins a methadone treatment with a Chilean doctor, Miguel Caballero, a journalist, investigates the killing of a drug dealer and his wife.

A fellow inmate, El Pirri befriends Paco and gives him a new pair of shoes to replace the stolen ones.

Pirri introduces Paco to El Lehendakari, a Basque gang member influential in prison.

Lehakandit's lover fails to follow him using the same ruse and commits suicide while Paco and Pirri were dazed by their heroin consumption.

The three friends, in an escalating life of crime, carry out a number of robberies to earn money in and around Madrid.

As the trio attacks an armored van, Lehendakari is injured in one shoulder so they flee to an abandoned house in Bilbao.

The journalist locates Paco and passes the information to Torrecuadrada who goes in search of his son in order to arrest him.