He easily guessed his way to the truth--the girl had simply made a convenience of him to vent her spite upon Tom Sawyer.
He was far from hating Tom the less when this thought occurred to him.
He wished there was some way to get that boy into trouble without much risk to himself.

Tom's spelling-book fell under his eye.

Here was his opportunity.

He gratefully opened to the lesson for the afternoon and poured ink upon the page.
Becky, glancing in at a window behind him at the moment, saw the act, and moved on, without discovering herself.

She started homeward, now, intending to find Tom and tell him; Tom would be thankful and their troubles would be healed.