Tom and Huck

Injun Joe kills Dr. Robinson because Robinson tries to seize the treasure map for himself. During the grave-robbing scene, Robinson attacks Muff Potter and Injun Joe with a knife, attempting to steal the map they had uncovered. Injun Joe fights back and uses Muff's knife to stab Robinson fatally, then frames Muff for the murder.

The earlier meeting between Injun Joe and Dr. Robinson establishes their conflicting motives for the treasure, hinting that violence would erupt between them.

Tom decides to testify because his friendship with Muff and his sense of justice override his oath to Huck. Although Tom and Huck swore a deadly oath not to betray each other, Tom cannot let an innocent man be convicted for a crime he did not commit. At the trial, he reveals what he witnessed in the graveyard.

Tom's earlier resolution to clear Muff despite the strain on his friendship with Huck foreshadows his choice to tell the truth.

Injun Joe hides the treasure in McDougal's Cave after retrieving it from its original location. After killing Dr. Robinson and obtaining the treasure map, Joe orders his partner to move the treasure to the cave and then burns the map to destroy evidence that could exonerate Muff Potter.

Injun Joe's earlier order to hide the treasure in a cave sets up the final discovery scene.

Injun Joe dies when he falls into a chasm inside McDougal's Cave. After threatening Tom and Becky, Joe confronts Tom, but Huck intervenes. Tom empties the treasure chest to threaten Joe and forces him toward a fatal edge, causing Joe to stumble and plummet to his death in the darkness below.

The earlier scenes of Joe threatening Tom and the boys getting lost in the cave build to this climactic confrontation.

Huck becomes distant because the strain of keeping the secret about the murder begins to fracture their friendship. With the map destroyed and Muff still accused, Huck feels the burden of their deadly oath and the secrecy pushes him away from Hannibal, though he continues to watch over Tom from a distance.

The oath scene directly establishes the weight of their secret, which logically leads to the strain in their relationship.

Tom and Becky discover the treasure while trying to find their way out of McDougal's Cave after getting lost during the festival. They uncover Injun Joe's hidden treasure chest, which Tom uses to lure Joe into a fatal trap. Later, Tom and Huck claim the treasure together and are celebrated as heroes.

The children's unauthorized exploration of the cave during the festival leads directly to this discovery.

Muff Potter is accused because he was found unconscious at the murder scene with his own knife in hand. Injun Joe framed him by placing the murder weapon beside Muff, who had no memory of the incident due to being knocked out. The circumstantial evidence pointed to Muff as the culprit.

The graveyard scene shows Robinson attacking Muff before Joe kills Robinson, establishing how Muff became the prime suspect.

The dead cat ritual is a folk remedy for removing warts. Tom and Huck bring a dead cat to the graveyard at night, intending to use it to cure warts by burying it at a crossroads at midnight. This superstition leads them to witness the grave-robbing and murder that follows.

The wart-removal ritual serves as the plot device that puts the boys in the graveyard at exactly the right time to witness the crime.

Injun Joe discovers that Tom saw the murder when he learns about Tom's presence in the graveyard that night. Joe threatens Tom to keep him silent, warning the boy not to testify about what he witnessed. This threat forces Tom to weigh his safety against his moral duty to tell the truth.

The tension in the graveyard scene, where Tom and Huck hide and watch, plants the seeds for Joe's later discovery.

The children sneak into McDougal's Cave during the festival without adult supervision. While exploring the dangerous tunnels, Tom, Becky, and the others become disoriented in the dark and cannot find their way out, leading to a dangerous ordeal before they eventually discover an exit.

The festival atmosphere provides the opportunity and distraction that allows the children to enter the cave unsupervised.