The Cthulhu novel series was a series of fantasy novels written by HP Lovecraft, including Cthulhu's Call, Cthulhu's Apocalypse, Cthulhu's Rage, Cthulhu's People, and Cthulhu's Chaser. These novels mainly talked about the interaction between humans and the alien civilization Cthulhu, as well as the helplessness and despair of humans in the face of Cthulhu's power. The Cthulhu series was not suitable for everyone because of its dark fantasy. If you are interested in this type of novel, you should first understand the background and storyline of the novel before deciding whether to read it.