Cursed is told through the eyes of Nimue, the Lady of the Lake character from the King Arthur legend. Nimue is a teenager with a mysterious gift, and the series shows how she came to be on the road to her destiny. After her mother dies, Nimue joins a young mercenary named Arthur, on his quest to find the magician Merlin and deliver an ancient sword. The future Lady of the Lake become a symbol of courage and rebellion against the terrifying Red Paladins, and their complicit King Uther.