Tom falls in love with Becky Thatcher, a new girl in town, and persuades her to get “engaged” to him. Their romance collapses when she learns that Tom has been “engaged” before—to a girl named Amy Lawrence. Shortly after being shunned by Becky, Tom accompanies Huckleberry Finn, the son of the town drunk, to the graveyard at night to try out a “cure” for warts. At the graveyard, they witness the murder of young Dr. Robinson by the Native-American “half-breed” Injun Joe. Scared, Tom and Huck run away and swear a blood oath not to tell anyone what they have seen. Injun Joe blames his companion, Muff Potter, a hapless drunk, for the crime. Potter is wrongfully arrested, and Tom’s anxiety and guilt begin to grow.
Tom, Huck, and Tom’s friend Joe Harper run away to an island to become pirates. While frolicking around and enjoying their newfound freedom, the boys become aware that the community is sounding the river for their bodies. Tom sneaks back home one night to observe the commotion. After a brief moment of remorse at the suffering of his loved ones, Tom is struck by the idea of appearing at his funeral and surprising everyone. He persuades Joe and Huck to do the same. Their return is met with great rejoicing, and they become the envy and admiration of all their friends.