Follow bioarchaeologist Cat Jarman – and the cutting-edge forensic techniques central to her research – as she uncovers epic stories of the Viking age and follows a small ‘Carnelian’ bead found in a Viking grave in Derbyshire to its origins thousands of miles to the east in Gujarat. By examining teeth that are now over one thousand years old, she can determine childhood diet, and thereby where a person was likely born. With radiocarbon dating, she can ascertain a death date down to the range of a few years. In 2017, a carnelian bead came into her temporary possession. River Kings sees her trace its path back to eighth-century Baghdad and India, discovering along the way that the Vikings’ route was far more varied than we might think, that with them came people from the Middle East, not just Scandinavia, and that the reason for this unexpected integration between the Eastern and Western worlds may well have been a slave trade running through the Silk Road, and all the way to Britain.