What book does Jem read to mrs dubose?

Jem reads "The Gray Ghost" to Mrs. Dubose in the novel "To Kill a Mockingbird" by Harper Lee.

This is a significant moment in the story, as it reveals Jem's growing sense of responsibility and compassion. He is tasked with reading to Mrs. Dubose, a morphine addict, as a punishment for destroying her camellias. While she is initially unpleasant, Jem's patience and dedication in reading to her are rewarded when she eventually breaks free from her addiction.