Cathy a Young girl receives for her 10th Birthday a duck egg. The duckling chooses Cathy as best friend and Margaux as mother. Sadly Margaux sits in a wheelchair and her parents forbid her to let the duck in their house. To save the duck from becoming cat food, They come up with a plan to release the duckling in the presence of his congeners. This is the start of a great adventure as the two secretly go on journey, chased by their anxious parents and even the police forces.