Learn in depth all the details and curiosities of ‘El maestro del Prado’ and ‘El ángel perdido’, the last two novels by Javier Sierra. This application offers unknown details of the creation process of this prestigious writer. It is, ultimately, a different way to get into the narrative process of the hand of the author and with a lot of information that makes the result even more exciting novels if possible. The application includes links to major online stores to buy the novels and receive at home, biography of Javier Sierra and shows the writer’s activity on social networks.