Martha is a maid serving the eternal night vampire royal family in the Middle Ages. According to the ancient castle tradition, maids can leave with subsidies at the age of thirty. One day before her freedom, she spends a night with Lord William, the supreme vampire ruler. Mistaking him for an ordinary knight and fearing severe castle laws, she flees secretly. Fascinated by her, William searches relentlessly for five years. Later, Martha gives birth to his child. Branded as a shameful unwed mother and bullied by villagers, she returns to the castle with her kid. Slandered and framed by vicious relatives and jealous servants, she is repeatedly sentenced to hanging. Just as she faces death, William finally recognizes the woman he has been seeking for years.
