Oisin was the bravest and most handsome young warrior in The Fianna and he loved adventure. So when a beautiful girl, Niamh, galloped across the waves to invite him to the Land of Eternal Youth, Oisin could not resist. He had to see Tir na n'Og for himself.

But how did he get on in a country where no one ever grew old? And did being forever young bring him any joy? This story tells how Oisin's desire to stay youthful becomes instead a quest for human happiness.