Like the previous novels, Celia en el mundo reflected a country slowly entering its civil war years, as well as the, often negative, general views people of those times had towards certain social groups, including the Moors, the Galicians, and to a lesser extent, the French, as well as the religious communities, such as the nuns.

Celia is taken to her uncle's home in Madrid, to live with Basílides, Rodrigo's servant, and Maimón, a young Moor boy; two characters who could hardly stand each other's presence.

At home Celia deals with constant arguments between her uncle and Basílides, as well as the latter's beloved pet owl, and the battling between the servant woman and Maimón.

Basílides has a hard time adapting to this strange place where no one can understand her Spanish, but Celia manages to make a couple of very good friends.

When the two girls are severely punished over a series of mischief, Celia tries to escape with Paulette, who's being sent off to a school in Paris, and manages to crash the car she had stowed away into against a tree.

Some major characters from the fourth book played rather small roles in the series, including Tío Rodrigo, Maimón, Basílides and Tía Julia.

Tío Rodrigo, played by Spanish actor Tito Valverde, was represented as a very loving uncle to Celia and a dear brother-in-law to her mother, also referred to as "very handsome" by the girl.

His last appearance was in the very same episode, when he invites Celia to his quiet and boring birthday party, where the girl and her two snobby girl-cousins celebrated together as he retired due to a headache, as well as the pressures of aging.

Basílides, played by the Spanish actress Diana Salcedo, was introduced in Rodrigo's birthday party, where she tried to keep the three girls in peace with one another, and especially from upsetting their uncle.