In 1785 on the verge of the French Revolution, Louis the 16th launches the most ambitious martimie adventure of the Enlightment century. He entrusts his best navy officer Comte de Lapérouse, to lead the expedition which aims at opening new trading routes and further Captain Cooks' travel. Three years after their departure, the two French vessels, la Boussole and l'Astrobale vanished somewhere in the Southern Pacific, with 200 of the best scientists, artits navy officers and seamen on board. We ar embarking on a thrilling treasure quest in the South Pacific, searching on land and underwater for traces and remains of survivors. This film takes us from the haunted Vanikoro Island to the Forensic Institute of French Police, trying to identify the skeleton found underwater by the coral reef where the ships collapsed...an historical detective story leading us onto the 20th century, trying to shed a new light on the Laperouse Mystery.