In Colombia, a country ravaged by war and synonymous with drugs and violence, Ross Kemp meets the people involved in the brutal guerrilla fighting tearing the country apart.For forty years Colombia has been embroiled in civil war as paramilitary and guerilla forces fight for control. What isn't widely known is the part gangs play in this conflict and Ross meets with the most secretive of them all, the Sicarios. These small groups, mostly under the employ of the paramilitaries, operate as 'hit-squads', killing whoever is considered a threat."