Heart Stone: City of the Mer

Part 3 of the fantasy series, ‘Heart Stone’.
As forces on the world of Tarnasus begin to gather against each other, the three sethundra, Artemis, Baccus and Dardanus leave to bring word to the remaining Guardians that they are in danger of coming under attack from the mysterious Brethren.
Meanwhile, Katy and Dylan flee the Academy at Sky Rock, only to find themselves on a new world where they are forced into facing a destiny that neither expected or wanted.
And hidden in the Vale of Glamorgan, the residents of the village of Carreg-y-galon prepare themselves for war.