El día que murió A.W. is a Spanish reading book from the Metrópolis series designed for language learners at level B1. It follows a narrative centered around a mysterious or dramatic event involving a character known as A.W., developing through suspense and investigation-style storytelling. The book is intended to improve reading comprehension in Spanish while exposing learners to real-world vocabulary and structured narrative language, and it may include an accompanying CD with audio support.