It stars Miguel Ángel Silvestre and Belén López alongside José Coronado, Federico Luppi, and Lluís Homar.

The plot tracks the plight of Daniel, a young boxer (and an inmate) experiencing personal guilt for killing a man (Salgado) in prison in a hit job.

[3] It was shot in 2005 in Palencia's former provincial prison, the Campo de la Juventud sports center, as well as several locations in Madrid.

[4] Jonathan Holland of Variety deemed the film to be a "polished, well-plotted noir item that provides all the thrills, though it clings too desperately to genre stereotypes".

[4] Javier Ocaña of El País considered that the film, "skillfully made and with dialogues of a certain level", "is a product as entertaining as it is solvent".