During a horse race, Ana, a happily married woman with a child, he met Captain Brown. Later, they meet again on a long train journey and inevitably love arises. Both try to forget each one on his own, however, things go more and more complicated, making it impossible to stop the situation.

After a period of sorrow, Fernando de Arellano, a rich businessman who has recently lost his young wife Blanca from a serious ilness, meets Mónica, who looks identical to her.