The narrative unfolds as an armed robbery unfolds on the bus route linking Barcelona's airport to its neighboring cities. The aftermath leaves three assailants deceased and a fugitive sought after with an arrest warrant, while six witnesses remain unable to pinpoint his identity. Officer Fran Garza, portrayed by Pablo Molinero, and his seasoned, yet estranged, partner Rebeca Quirós (Ana Polvorosa) harbor suspicions that the witnesses are concealing the truth; they unanimously deny witnessing the killer's face, yet incriminating evidence hints at a conspiracy of silence to shield the fugitive. Swiftly, the case gains traction, capturing the public's imagination, and fostering a wave of sympathy for the perpetrator under the viral hashtag.