In Irish Mythology, Otherworld is a happy land and Underworld is a foul land. These worlds exist alongside Earth.

Wizard Drowe is sentenced to be a swan, but he escapes. He has tricked Ciarán, his apprentice into becoming the swan.

Granny and Aoife pursue the swan because Granny believes it will lead her to her lost village.

Hunted by Wizard Drowe and the vampire Dearg-due, Ciarán and Aoife move from initial dislike to romance.

These in turn are pursued by Venus and the Drimnagh Witches, servants of the Faerie Queen.

Behind the scenes Druid Lochlain manoeuvres to replace the Faerie Queen.