Although the main character Sira is fictional, others with whom she interacts were real like Beigbeder, the Spanish High Commissioner in Morocco; Serrano Suner, Franco's brother-in-law; and Rosalind Fox, the English socialite/spy.
The English translation of the series title is "The Time Between Stitches," a metaphor for the struggles of being involved and caught in the middle of WWII and the Spanish Civil War.