In The Gri-Gri of Niokolo-Koba, a native of Senegal throws himself in the taxi of Spirou and Fantasio in their asking to carry the contents of a bag that it leaves them in Mansa Moussa, in Niokolo-Koba, before disappearing in a dazzling flash. The two heroes leave then for Africa, and are joined by strong Sété Bagaré, which binds friendship with them. Once in Senegal, they learn that Mansa Moussa also disappeared, and that what they transport in the bag is not other than the grigri of the individual. Arrived at the park, they are informed of the disappearance of most of the animals of the reserve. Ororéa, which inquired in the reserve, occurs then with the photographic proof that the animals disappeared under the effect of diamond of Koli, also responsible for the evaporation of the individual met in Europe, which is not other than the nephew of Mansa Moussa. After some adventures, they end up finding the gangsters. The diamond of Koli is replaced in its sheath and all those that disappeared return, just like the animals. Mansa Moussa privately explains to Spirou that the grigri contained the plans of a diamantiferous vein under the park that the gangsters coveted. Those having disappeared following an imprudence with diamonds of Koli, alone Mansa Foamed and Spirou know the truth from now on.

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