Doña Eremita sets off for a quiet cycle with her faithful dog, Mambrú, but she just can't help thinking of ways to improve her bicycle. Before very long she has added three very loud horns, a bucket of water to wash her hands, a complete tool kit. And by the time she has also added a seat for Mambrú, two umbrellas, a cassette player and a mouth-organ, Doña Eremita is riding a very eye-catching contraption. But it is when she finally adds the mast and sail, that Doña Eremita really runs into trouble.