Somewhere in Equatorial Africa, in the '50s, John Baxter, an American from Detroit, earns his living with his truck, on the side of which is written "Africa express". He sells and buys nearly anything, his customers are inland tribes, miners, a Catholic Mission, held by Father Gasperini, a certain Robert Preston, farmer, who captures wild animals and sells them to various zoos.

Turi Leofonte is a former mafioso who agrees to testify in a trial involving very important people within the organization. For the mafia, Leofonte is dangerous, which is why he must die.

Ursus and his sword-wielding companions run head-on against a usurper of a throne.