The plot of the novel revolves around the curse that has been placed on the Rokes family, which states that the eldest son of each generation will be killed by a supernatural force. This curse is seen as a punishment for the sins of the family's ancestors, and it is inescapable. No matter what the Rokes family does, they cannot escape the curse, and they must all face the consequences of their actions.
The theme of the novel is reinforced through the use of various symbols and motifs, such as the curse itself, the family's mansion, and the supernatural forces that surround the family. These symbols and motifs all work together to create a sense of foreboding and dread, and they highlight the inevitability of fate and retribution.
Ultimately, the novel is a cautionary tale about the dangers of pride and arrogance, and it warns of the consequences of one's actions. It is a powerful and thought-provoking story that will stay with readers long after they have finished it.