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I read this series in the 90s. The lead character is a girl. She's "seduced" I guess by some creature, not sure if he is a vampire. She discovers he's interested in her because she was born on the 12th stroke of midnight. She has a birth Mark or some such thing on her hand or wrist that tingles when he wants her to visit him. I'm not sure if there's caverns or something below her house but I remember she feels weak down there and he's strong. There's at least three books.