Final answer:
The writer conveys a tone of admiration and criticism.
Step-by-step explanation:
The tone that the writer conveys in the given passage is a mixture of admiration and criticism. While the writer acknowledges that the book 'The Adventures of Tom Sawyer' by Mark Twain tells the truth for the most part, they also mention that there were some things that the author stretched. This indicates a balanced and nuanced perspective, where the writer appreciates the truthfulness of the book but also acknowledges its flaws.