Tom falls in love with Becky Thatcher, a new girl in town, and persuades her to get "engaged" by kissing him. But their romance collapses when she learns Tom has been "engaged" previously to Amy Lawrence. Shortly after Becky shuns him, he accompanies Huckleberry Finn to the graveyard at night, where they witness a trio of graverobbers, Dr. Robinson, Muff Potter and the halfbreed Injun Joe, getting into a fight. While Potter is knocked unconscious during the scuffle, Injun Joe knifes the doctor to death and later pins the blame on Potter, who is arrested and charged with murder.
Tom and Huck run away to an island. While enjoying their new found 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 his loved ones' suffering, Tom is struck by the idea of appearing at his own funeral.
Back in school, Tom gets himself back in Becky's favor after he nobly accepts the blame for a book she has ripped. Soon, Muff Potter's trial begins, in which Tom testifies against Injun Joe. Potter is acquitted, but Injun Joe flees the courtroom through a window. Tom then fears for his life as Injun Joe is at large and can easily find him.