Cassie must rescue her brother from the Fair Folk, who dwell in the underworld of Annwn. But the task is no simple one . . .
Cassie's older brother Byron has fallen in with the wrong crowd - it's soon clear these boys are wild, reckless and not human at all. They are tylwyth teg - Fair Folk, who tempt humans down into the dark places of the world. And Byron is tempted. When he goes missing, Cassie and her cousin, Si
