It stars Antonio de la Torre and Roberto Álamo as a couple of flawed police investigators tracking down a serial killer of elderly women in Madrid.

In the hot summer of 2011, against the backdrop of the economic crisis and the 15-M Movement, Madrid is swarmed by a million and a half of pilgrims awaiting the visit of Pope Benedict XVI.

[12] Jonathan Holland of The Hollywood Reporter wrote that Sorogoyen "mixes up police procedural, social crit, character study, black humor and Catholicism into a taut and distinctive whole", summing up as a bottom line: "sweaty and suspenseful".

[9] Carlos Marañón of Cinemanía rated the film 4 out of 5 stars, deeming it to be a benchmark noir for Madrid's Augusts, supported by a dedicated and well-understood costumbrismo, and channeling Spain's recent past.

[13] Quim Casas of El Periódico de Catalunya also gave it 4 out of 5 stars, considering the Sorogoyen shoots well the oppression of the moment and the atmosphere, with the film, up until certain point, "confronting and unscrewing the two protagonists, both of whom are plunged into their own hells".