The plot explores the Assault on the Central Bank of Barcelona [es] in May 1981, three months after the 23-F coup d'état attempt, as a group of 11 robbers took over 200 hostages and demanded the liberation of putschist general Antonio Tejero and three of his collaborators.

[1] Produced by Brutal Media for Netflix,[4] the series was written by Patxi Amezcua and directed by Daniel Calparsoro.

[5] Tommie Ferreras was charged with the cinematography and Calparsoro's recurring collaborator Carlos Jean with the musical score.

[7] Paula Martínez of Cinemanía deemed Bank Under Siege to be a "an entertaining series with good pace, tension and interest that takes us through an important (and unknown to many) moment in our history".

[2] Raquel Hernández Luján of HobbyConsolas gave the series 72 points ('good') declaring it "a brave, addictive and fast-paced miniseries that takes us to a recent conflict [while] spurring our curiosity.