While investigating the murder of a journalist, Léa and Greg look into the secrets of the Africa, which was shipwrecked in 1920 off the coast of Les Sables d'Olonne. On board were many Senegalese returning home after the First World War.

While investigating the murder of a journalist, Léa and Greg look into the secrets of the Africa, a true "French Titanic" which was shipwrecked in 1920 off the coast of Les Sables d'Olonne. On board this steamer which rallied the various colonial ports were many Senegalese skirmishers returning home after the First World War. Had the journalist figured out the theft of the liner's legendary treasure? Does the 47 meters deep wreck have new secrets to reveal?—Happy_Evil_Dude