The Horn of the Rhinoceros

Spirou and Fantastico rescue their friend the racecar driver Roulebille who has been wounded by murderous thugs. Roulebille's employers, Turbot, have designed a car so spectacular that competitors will stop at nothing to steal its revolutionary plans.

In order to find Roulebille's partner, Martin, and retrieve the car's blueprints, the two reluctantly team up with another journalist, Seccotine. After retrieving the missing blueprints from the titular body part, Spirou and Fantasio are given the very first prototype of the car, baptised Turbot-Rhino to celebrate their adventure.