In a corrupt Mexican town, police trainee Hector is dragged into a bloody battlefield every night, bringing back cold arms and strange "beacons." When his partner disappears mysteriously, he is forced to hide the summoned soldiers on the streets. Patrolling during the day and fighting at night, he must use these bloody "gifts" to fight his way out of the sinful city. When the rusty police badge meets the infinite arsenal, justice grows in the cracks.