The Storm Keeper’s Island by Catherine Doyle.
Winner of the IBW 2019 Book Awards (Children’s Category)
When Fionn Boyle sets foot on Arranmore Island, it begins to stir beneath his feet …
Once in a generation, Arranmore Island chooses a new Storm Keeper to wield its power and keep its magic safe from enemies. The time has come for Fionn’s grandfather, a secretive and eccentric old man, to step down. Soon, a new keeper will rise. But, deep underground, someone has been to waiting for Fionn. As the battle to become the island’s next champion rages, a more sinister magic is waking up, intent on rekindling an ancient war.