Alice Roberts visits Canterbury to explore the Plantagenet era, when the powerful house held the throne between 1154 and 1485. She discovers the secrets of the city's cathedral, a centre of ecclesiastical power and also the site of the shocking murder of Thomas Becket. She also discovers the lasting impact of the Black Death and joins a modern-day pilgrimage in medieval garb. Aerial archaeologist Ben Robinson provides a bird's-eye view of how the religious institutions of the era still dominate the city's topography.