Algeria, 1960. A section of French paratroopers are sent in search of a missing aircraft in the Algerian desert. The wreckage of the plane is quickly located, but there are no survivors, just a suitcase stamped “Top Secret”. Stormed by enemy soldiers, the troops find refuge in a strange abandoned citadel. Despite warnings from the place’s Guardian to leave at once, they wake up the Djinns, the evil spirits of the desert .

Paris, 1910. Emile, a shy movie projectionist, and Raoul, a colourful inventor, find themselves embarked on the hunt for a monster terrorizing citizens. They join forces with Lucille, the big-hearted star of the Bird of Paradise cabaret, an eccentric scientist and his irascible monkey to save the monster, who turns out to be an oversized but harmless flea, from the city's ruthlessly ambitious police chief.