After Abada and the Bentoura figures, Mohamed Bentoura, reveals the hidden face of the Soso empire and the mysteries of LAGA (the black school). Bentoura, a sociologist researcher, is inspired daily by a sentence used in the Soso community, the twelve words (Woyen Fou Noun Firin). A search or confront the esoteric traditions and the formidable intelligence of the sema, in search of the secret best kept in an African society.