If you are either learning Spanish, or learning English as a second language (ESL) as a Spanish speaker, this book is for you. There are many editions of The Hound of the Baskervilles. This one is worth the price if you would like to enrich your Spanish-English vocabulary, whether for self-improvement or for preparation in advanced of college examinations. Each page is annotated with a mini-thesaurus of uncommon words highlighted in the text. Not only will you experience a great classic, but learn the richness of the English language with Spanish synonyms at the bottom of each page. You will not see a full translation of the English text, but rather a running bilingual thesaurus to maximize the reader's exposure to the subtleties of both languages.