In this book, we immediately find an acquaintance in the narrator. The reader knows by inference and dialogue (though he does not directly introduce himself) that the narrator is Dr. Watson. Holmes talks directly to Dr. Watson, the narrator, and Dr. Watson responds, and frequently refers to himself as well as his actions. This is the first difference between The Hound of the Baskervilles and Lady Audley’s Secret. In this book, we as readers have a more direct relationship with Dr. Watson as a narrator.
Secondly, this book differs from Lady Audley’s Secret in its descriptions in general. In Lady Audley’s Secret, the descriptions of even simple objects (such as letters) are long, drawn out, and elaborate. Descriptions in The Hound of the Baskervilles are detailed and intriguing, however, they are not as whimsical, or tied to moments of emotion in the text. In Lady Audley’s Secret, the more important and emotionally-tied an object or a person was, the longer and more elaborate the description. (Such as many descriptions of Lady Audley, for instance).
These two superficial differences are the first noticeable when beginning to read.