Mobile phones: everyone owns one, they are indispensable in our modern lives. But what almost no one knows: in each one of these devices is blood. Because these small marvels of technology do not work without a metal named Coltan. The main source of this material lies in the Democratic Republic of the Congo. It is also one of the main sources for the war there. This film explores how these mobile phones are funding killings in the Congo and how people with powerful interests are maintaining this blood trade.