When a man's best friend is shot in cold blood by two corrupt policemen, he must track down the only eyewitnesses, who have deported to Mali.

An educated native of Mauritania tries to find work in Paris but encounters difficulty because of his race.

On 2 January 1899, starting from the French Sudan, a French column under the command of the captains Voulet and Chanoine is sent against the black Sultan Rabah in what is now the Cameroon. Those captains and their African mercenary troops destroy and kill everything they find on their path. The French authorities try to stop them sending orders and a second troop but the captains kill the emissaries who reach them. Sarraounia, queen of the Aznas, have heard about the exactions. Clever in war tactics and in witchcraft, she decides to resist and stop those mad men.