The rural northeast of Thailand is home to the fabled Gwi people; an ancient tribe of elephant keepers known as mahouts. For centuries they have relied on their symbiotic relationships with elephants for survival and social devlopment. As their landscape changes ecologically and economically, so too does Gwi culture. "Mahout: Changing Reigns" explores this cultural evolution and the Gwi's legendary link to elephants through the last living docents of a bygone era.