Quinquin is now a grown-up and goes by the nickname CoinCoin. He hangs out on the Pas de Calais and attends meetings of the Nationalist Party with his childhood friend Fatso. His old love, Eve, has abandoned him for Corinne. When a strange cow-pat like substance is found near the town, the inhabitants suddenly start to behave very weirdly. Captain Van Der Weyden and his loyal assistant Carpentier investigate these alien attacks. The Extra-Human invasion has begun.