Barcelona, ​​Spain, 1921. A tough cop from Madrid arrives in the city to locate, under the suspicious scrutiny of corrupt local police officers, a significant amount of military weaponry stolen from a train, allegedly by revolutionary anarchists.

Spain, 1950s. Montse’s agoraphobia keeps her locked in a sinister apartment in Madrid and her only link to reality is the little sister she lost her youth raising. But one day, a reckless young neighbor, Carlos, falls down the stairwell and drags himself to their door. Someone has entered the shrew’s nest… perhaps he’ll never leave.