Back at school, Tom finally wins Becky's heart when he takes the blame for one of her indiscretions and heroically suffers the punishment for her misdeeds.
At Muff Potter's trial, it is generally accepted that Muff Potter killed Dr. Robinson and will be hanged. Tom, in spite of his oath with Huck to not reveal what he has seen, cannot stand to see an innocent person hanged for a crime he did not commit. He bravely relates what actually happened. Injun Joe makes his escape by jumping out the second story window.
One day, while Tom and Huck are looking for buried treasure, they explore an old abandoned house. When two men arrive, the boys are trapped upstairs. One man is Injun Joe in disguise. The two criminals retrieve a box of silver coins they had concealed and then, by chance, discover a horde of gold coins that had been buried by some outlaws long ago. They decide to take the gold coins to Injun Joe's other hideout. The terrified boys overhear Injun Joe planning a horrible revenge before leaving the country. The boys fear that they are the subject of his planned vengeance but are fortunate enough to narrowly escape detection. The boys try to discover a place in town that would be the other hideout, but they only find a room filled with an abundant supply of whiskey in a Temperance Tavern.
At the picnic celebrating Becky Thatcher's birthday, several of the boys and girls enter McDougal's Cave. Tom and Becky wander away from the others in search of privacy and become hopelessly lost.
