From the back of the book:
Vietnam and the surrounding region witnessed a time of extreme turmoil and political foment during the 20th century. Many great RPG supplements have addressed the Vietnam War (American War), but few have explored the period of time immediately preceding American entanglement.
In Journal d'Indochine, we present a set of scenarios for the Call of Cthulhu 7th Edition roleplaying game set in French colonial Vietnam (~1925 to 1955). In this second volume, we continue to explore historical and morally ambiguous stories with a unique Lovecraftian twist. We have also included in this supplement valuable campaign resources, including details on the French Foreign Legion and other French military forces, and a collection of narrative frameworks to help an enterprising Keeper build out an exciting and authentic campaign to explore ancient Mythos horrors.