Answer:
only knows what Utterson and Poole know, which builds suspense.
Step-by-step explanation:
According to the given excerpt, there is conversation between Mr. Utterson and Mr. Poole using third person limited point of view as they debate whether the voice they heard was the voice of the butler's master.
One advantage to having this excerpt told from a limited third-person point of view is that the reader only knows what Utterson and Poole know, which builds suspense.