A hidden gem is 'The Witches of New York' by Ami McKay. It's set in 1880 and follows two practicing witches who run a tea shop and a young woman with latent abilities. The magic is herbal, spiritual, and sometimes chilling. The romantic elements are subtle but poignant. It's a beautifully written, atmospheric book about female power and mystery.
Looking for something steamy with a lot of atmospheric dread? 'The Death of Jane Lawrence' by Caitlin Starling is a gothic horror-romance where the male lead is a magician-surgeon and the female lead, Jane, becomes entangled in his dark, bloody rituals. It’s less 'witch' in the traditional sense and more 'person stumbling into a terrifying magical reality.' The romance is deeply intertwined with horror, obsession, and bodily transformation. It’s a slow, chilling burn where love and horror are two sides of the same coin. Not a light read, but unforgettable if you like your supernatural romance with a heavy dose of existential dread.