Each time Queen Rhiannwn bears a child, it's stolen away by an elusive beast.
Is it because the king once spent a year ruling the No World? Or because Rhiannwn herself is from there?
It's only when she rides out alone into the wilds that a son is safely delivered.
A son who ages three years each day.
A son who's also stolen away.
Rhiannwn is determined to rescue him; despite knowing who's responsible.