Laos, 1866. Hirondelle d’Or, a mysterious spy, follows closely the Mekong exploration mission led by Captain De Castel. As the expedition moves deeper into the country, the young woman and the military man attract each other, become closer and fall in love. The botanist Odile Dubuisson and her daughter Marie explore the jungles of northern Laos, 150 years later, following in th...