Lengua de dragones (Lengua de dragones, 1)

London, 1923. Dragons soar through the skies and protests erupt in the streets, yet Vivien Featherswallow remains unconcerned. She is determined to play by the rules, secure a summer internship studying dragon languages, and ensure her younger sister doesn't grow up as a third-class citizen. By midnight, Viv has ignited a civil war. Cornered by the consequences of her actions, she does not hesitate to accept a mysterious "job" offer when it comes her way. But upon arriving at Bletchley Park, Vivien discovers she has been recruited to decipher the secrets of an unknown dragon language—a task that will enable the government to win the war. If she succeeds, she and her family will be free. If she fails, everyone will die.