Answer:
In chapter 13 of The Hound of the Baskervilles, Sherlock Holmes tells Sir Henry a lie about his plan to leave for London the next day. Holmes claims that he needs to return to the city to follow up on some important information, when in reality, he intends to stay in the area to continue his investigation. By keeping this information from Sir Henry, Holmes hopes to keep him safe while he delves deeper into the mystery surrounding the hound.
Step-by-step explanation: