Gudule is a funny and mischievous little girl, a little tomboyish and full of imagination. And his life is filled with adventures! Gudule spends her time finding herself in delicate situations, from which she tries to get out by telling lies... But the truth always ends up coming out! She can count on her friends Bertrand and Cheb to counter Marie-Aglaé, the best in class, and Paulo, the school terror.