The Blackthorn Branch

Cassie and her cousin Sian venture into Annwn, the underworld, in pursuit of Cassie's missing brother Byron, who has become entangled with the mysterious and dangerous Fair Folk known as tylwyth teg. As they navigate this dark realm, they discover that the Fair Folk are restless and seeking to protect their world from human harm, with Byron caught in the midst of a larger struggle. The story explores their journey to rescue Byron before it’s too late.