Sometime in the 18th century, a group of Greeks from the island of Crete met a grisly end at a lake high in the Himalayas, over 5,000 feet above sea level. The small lake, known as Roopkund or Skeleton Lake, was already home to two scatters of deceased south Asian pilgrims, presumably Hindus, who had died there in the 8th and the 11th century CE. On one of the earlier pilgrimage parties, a southeast Asian, either from modern-day Thailand or northern Burma, had joined them in their unlucky fate. None of this was known from documentary sources, local legends or excavation. Only in the last four years have aDNA and strontium analysis - pioneered by the David Reich Lab at Harvard - been able to tell this story, unravelling the genomic signature of each individual and the diet they ate. Roopkund Lake sits close to the Indian border with Nepal, and lies on a popular mountaineering trail for local guides and foreign tourists. The skeletons, scattered about the lake, some with hair and fing