They work from the Netherlands, Denmark or the United Kingdom, but they deal with mass crimes occurring on the other side of the world – in Syria, Rwanda or Nepal. “They” are the prosecutors in the war crimes units (WCUs). These highly specialized professionals are tasked with bringing to justice war criminals present on European soil, regardless of where their alleged crimes were committed. We met with these dedicated individuals who, in challenging circumstances and through endless legal complexities, seek justice for the most severe crimes.