 Celeste is a poor girl living with her mother Lucia. Lusia has cancer, and although she tries to hide it from Celeste, Celeste discovers it! Celeste works in a plant nursery, and one day, while transfering plants, she met Franco, whose car got stuck and he needed help. She helps him and he invites her to coffee. As they talk Franco tells Celeste the legend about the sun and moon (In Spanish Sol y Luna): St. Franciscus once gave all he had to  Brothers sun and Sisters moon , he thought that names have no importance and therefore he called the men Sol and the women Luna. After telling her the legend, Franco asks her what s her name and she answers: Luna. Without knowing each other s names, they set to meet in the same place tomorrow. Meanwhile Lusia gets worse and she s dying... Franco and Celeste continue to meat and they plant a tree together. They swear that as long as it lives, they will love each other. They set to meat the next day and tell their names... In that same night Lusia dies in Celeste s arms.. While Celeste was mourning in her house, Franco thought Celeste played a joke on him and he pulled the tree out... Aida, Lusia s best friend offers Celeste to move and live with her in order to leave the house, which was so full of memories. With a small number of personal things, Celeste comes into the castle of the Visconti family (Actually it s Ferrero, but all the family s fortune comes from the mistress side) The mistress, Teresa, who needed a new maid, thought that Aida brought her a new maid and she sends Celeste to wear uniforms. She was so manipulative, that neither Celeste, nor Aida could tell her she was wrong... Celeste became the maid then, and almost everyone dislike her. Teresa, is a very cold woman and she treats her badly, Enzo, Teresa s son, is  attracted  to Celeste and he tries to rape her many times. Rita, the daughter likes Celeste and they become friends. Celica, the matron is practically a witch and she also treats her badly. Only with Leandro, Teresa s husband (who is also Aida s brother) Celeste was able to create a kind relationship and they like each other. Then comes the last member of the family. After a few days the twin brother of Enzo comes back home and Celeste finds out he s no other than Franco... At first they are both angry at each other, but then they recocilliate and they fall in love with each other. But, not one of them knows the secret that Lucia has kept all her life...