One dark night, in the deserted streets of Nice, an American car slowly drives past Victor Menda, then slowly pulls up. A come on from the mysterious blonde at the wheel leads to Victor finds himself kissing and making love to the gorgeous creature. But as soon as the embrace is over the mantis-like beauty rejects him and, under the threat of a gun, makes him leave the car. Worse, she tries and nearly manages to kill him by running over him. Cars have plates, and Victor traces the address of the monstrous nymphomaniac. To his amazement, he discovers a beautiful villa, in front of which the American car is parked, where two blonde sisters live together, both of whom look sweet and harmless.