Two teenage boys unwittingly summon an ancient evil entity known as The Blind One by delving into black magic while trying to escape their mundane lives.

Sent to the market by his uncle to sell their horse and buy thatch for their roof, Jack meets the beautiful Princess Isabelle, whom he rescues from ruffians. He returns home with only a handful of beans given to him by a monk who claimed they were sacred, but that does little to impress his uncle, who tosses them away. In the night, the Princess arrives, having run off to keep herself from marrying Roderick, who is clearly only interested in becoming king. Soon, the beans take root with a giant...