Here's why:
* Gothic elements: The novel features a haunted house, a mysterious and deceased previous mistress (Rebecca), and a sense of foreboding and dread throughout.
* Suspenseful plot: The narrative is driven by secrets, hidden motives, and a sense of danger.
* Psychological elements: The novel explores themes of identity, obsession, and the power of memory.
While it's primarily Gothic suspense, it also has elements of romance and psychological thriller, making it a complex and captivating read.