The skeleton of an Indigenous American person, discovered beneath the shell pile at Indian Point, functions as a symbol that tests the limits of the children’s competence and reveals the deeper knowledge that Joe has concealed. Throughout the novel, the Aldens prove themselves resourceful enough to build a home, cook their meals, and even start a museum. The skeleton, however, represents a challenge that honest self-reliance alone cannot meet. When Joe uncovers the full set of bones, he tells the children, “We can’t move this skeleton because we haven’t the right tools” (96). This practical limitation carries symbolic weight: It marks the boundary where childhood ingenuity must yield to adult expertise and cooperative effort. In this way, the symbol develops the theme of Community Responsibility and Ethical Awareness, as the children learn that responsible action requires deference to expertise and consideration of broader consequences.

The episode also raises questions about excavation and display without interrogating them. The children treat the skeleton as a major discovery connected to their museum project, extending their pattern of collecting and organizing what they find on the island. The narrative does not address the cultural or spiritual meanings that burial may carry or the fact that the skeleton with an arrowhead is evidence of violence and erasure. Indigenous Americans appear in the scene through material evidence rather than as members of a living community.

The narrative also presents the remains as a clue that deepens the mystery. The discovery also exposes Joe’s hidden identity. His immediate, confident identification of bones, arrowheads, and the cooking bowl unsettles Henry, who thinks, “Joe is a very strange handy man” (52). The skeleton intensifies this tension because Joe’s authority over the find is unmistakable; he directs the dig, controls access, and instructs the children to tell no one but their grandfather. His knowledge reframes him from a helpful neighbour into a figure whose expertise the children depend on but do not yet understand. The skeleton thus connects the children’s summer project to a history that predates their arrival and exceeds their full comprehension.