Jones Graham Jones 
Return from Darkness [EPUB ebook] 

Schoolboy David’s life is changed for the better by an encounter with the guarded and mysterious headmaster of his school. A storyteller and mystic, he opens the timid boy’s eyes to the reality of 'other worlds’ beyond our own. Twenty-five years later, having returned to Pembrokeshire, David embarks on a quest that will take him deeper into these alien realms.