Wuthering Heights [suggested by Amy Gregg]

Wuthering Heights is a wild, passionate story of the intense and almost demonic love between Catherine Earnshaw and Heathcliff, a foundling adopted by Catherine’s father. After Mr Earnshaw’s death, Heathcliff is bullied and humiliated by Catherine’s brother Hindley and wrongly believing that his love for Catherine is not reciprocated, leaves Wuthering Heights, only to return years later as a wealthy and polished man. He proceeds to exact a terrible revenge for his former miseries.

The action of the story is chaotic and unremittingly violent, but the accomplished handling of a complex structure, the evocative descriptions of the lonely moorland setting and the poetic grandeur of vision combine to make this unique novel a masterpiece of English literature. [Product description from Amazon]

The book has a Wikipedia page.
It has been adapted for film and television an unprecedented 14 times, first in 1920 and most recently in 2011, and also three times as an opera! Rather than point to any one of these, here is a link to the Wikipedia disambiguation page, which lists them all.
Wuthering Heights also has its own dedicated website.

Author’s Wikipedia page.
Biographical notes on the above-mentioned website.

Shortlisted for this month

The book selector for the month can choose up to three books for nomination. This month Amy’s other choices were:

Dracula

‘There he lay looking as if youth had been half-renewed, for the white hair and moustache were changed to dark iron-grey, the cheeks were fuller, and the white skin seemed ruby-red underneath; the mouth was redder than ever, for on the lips were gouts of fresh blood, which trickled from the corners of the mouth and ran over the chin and neck. Even the deep, burning eyes seemed set amongst the swollen flesh, for the lids and pouches underneath were bloated. It seemed as if the whole awful creature were simply gorged with blood; he lay like a filthy leech, exhausted with his repletion.’

Thus Bram Stoker, one of the greatest exponents of the supernatural narrative, describes the demonic subject of his chilling masterpiece Dracula, a truly iconic and unsettling tale of vampirism. [product description from Amazon]

The book has a Wikipedia page.
Dracula has even more adaptations than Wuthering Heights. 14 for cinema alone, a further 9 for the stage, and 9 more for television. Once again they are all listed on the Wikipedia disambiguation page.

Author’s Wikipedia page.
Author’s fan site.