This classic of Gothic horror follows Laura, a woman haunted by a girlhood dream of a beautiful visitor to her bedroom. Now, a decade later, Laura finds Carmilla, who appears to be her own age, on the side of the road after a carriage accident. The two recognize each other from the same childhood dream and become fast friends. Soon after, Laura begins to experience mysterious feelings and is once again haunted by nightmares. She finds Carmilla strangely irresistible and longs to be with her.

But as the two friends grow closer, Laura's health begins to fail. It becomes apparent that her enchanting companion is harboring a sinister secret. To free herself from Carmilla's grasp, Laura and her family must fight for their lives.