Javier Castillo is a Spanish author best known for his psychological thrillers. He was born on March 1, 1987, in Andalusia, Spain. Castillo's breakthrough came with his debut novel "El día que se perdió la cordura" (The Day Sanity was Lost), which became an instant bestseller when released. His work often combines elements of suspense, mystery, and romance, and is characterized by fast-paced, intricate plots that hook readers from the first page. Prior to his writing career, Castillo was an enterprise consultant with a background in business administration and management. He self-published his first book, which caught the attention of readers and publishers alike through word of mouth and social media platforms. Following his initial success, he has published several other novels, cementing his reputation as a popular figure in the contemporary Spanish literary scene. Castillo's novels have been translated into numerous languages, extending his readership to an international audience.