The former pupils of the school "Ateneo" meet several years later to honor the retirement of the head master, Mrs. María. The house where everyone meets, still evokes ancient memories from that time. One of them proposes something very special, to play the journey exactly as they used to do it. From the 40 people committed, only 9 show up. Their frustration grows when the journey begins and they still don't know what are they going to do.

Un grupo de antiguos alumnos se reúnen con motivo del vigésimo aniversario de la fundación de su colegio. Entre sus recuerdos destaca especialmente una excursión en bicicleta a la sierra de Guadarrama.