Monday I referred to Wuthering Heights, the novel reviewed, as a historical romance, but no doubt as many of you can confirm, this classic not only fits into the Historical Romance subgenre, but Gothic Romance. In my opinion, these novels have a dark tone and are suspenseful; could be called Gothic/Romantic Suspense. This is very different from the contemporary Romantic Suspense novels, but is included nevertheless.
I can recommend novels that are Gothic/Romantic Suspense featuring the same or similar setting, atmosphere, general tone, and type of characters.
Usually some mystery and/or secret pervades the books.
Mistress of Mellyn and Bride of Pendorric, both by Victoria Holt, were the first books of this genre I read. Classics like Jane Eyre (Charlotte Bronte) and Rebecca (Daphne du Maurier) are similar books I recommend. The Woman in White (Wilke Collins), and Mariana by Susanna Kearsley (with its time travel element), are others.
I also enjoy reading Mary Stewart. There are innumerable Gothic/Romantic Suspense novels. This post is only a starting point. I hope this is helpful. Happy Reading!
Bronte, E. (1847). Wuthering Heights. London: Thomas Cautley Newby.
Holt, V. (1960). Mistress of Mellyn. Garden City, New York: Doubleday.
Holt, V. (1963). Bride of Pendorric. Garden City, NY: Doubleday.
Bronte, C. (1847). Jane Eyre. London: Smith, Elder & Co.
du Maurier, D. (1938). Rebecca. Garden City, NY: Doubleday & Co.
Collins, W. (1859). Woman in White. England: Pearson Education Limited.
Kearsley, M. (1994) Mariana. London: Corgi Books.