In this episode Sir Trevor travels to deepest Morocco and meets the young British vets working with mountaintribes to ensure the working animals upon which they rely on are kept healthy. In Barcelona he explores the magnificent La Sagrada Familia and then to Italy’s third biggest city Naples, where he meets a judge who is trying to smash the local mafia and meets some of the people who live in the shadow of one of the most dangerous volcanoes in the world – Vesuvius. Which scientists believe is overdue a major eruption.