Margarita Restrepo has been searching for her daughter who disappeared during the Colombian civil war more than a decade ago. She believes her daughter's body may be in a mass grave on the edge of the infamous Comuna 13 slum in Colombia's second largest city, Medellin. Many of those who disappeared at this time are believed to be victims of the notorious military operation known as 'Orion'. In this operation, government soldiers and paramilitary death squads worked together to 'disappear' opponents. As Margarita struggles to find her missing daughter, she meets the lead forensic investigator working on the grave site hoping to find closure for the families. Also assisting with this process is a former death squad commander, 'Mobile 8'. Now behind bars, 'Mobile 8' provides a rare account into the operations behind the 'disappearances' and potential insight into what may have happened to Margarita's daughter.