Periwinkle — Peri for short — is a young woman who has lost her father at sea. She lives with her mother until her grief-stricken mother becomes too difficult to live with. Peri then retires to an abandoned shack on the beach.

She decides to put a hex on the sea and force it to give back her father. While making the hex, she meets a young man on a black horse whom she later learns is the son of King Ustav. He convinces her to add some things to her hex and this starts the action. Soon a sea dragon appears and the townspeople hire a magician to free it and claim the gold chain which binds it to the sea.

Kir is the royal son of King Ustav.

He appears on the beach one day and later appears at Peri's door. Eventually he discovers that although...