Consider some of Isabel Allende’s other novels, like Maya’s Notebook, Ripper, and The Japanese Lover.
Consider assigning books that have inspired Isabel Allende like One Hundred Years of Solitude by Gabriel García Márquez, The Captain's Verses by Pablo Neruda, and The Arabian Nights.
It might be interesting to study The House of the Spirits alongside another Chilean author, Roberto Bolaño, who had a contentious relationship with Isabel Allende. Distant Star is one of Bolaño’s novels.