Two teenagers Gwyl and Liz are drawn into a time warp and join the denizens of the otherworld in the constant battle between the powers of the Light and the Dark. They seek the Dragon’s Eye, a huge flawless amethyst crystal that holds the power to influence the battle either way. They discover the Eye but it is lost to them and all seems in vain. Years later with their friend Giles, they are once again drawn into that otherworld which now has intruded into their own. It is Giles alone who has to face the Power of the Dark in a final great conflict. He wins the battle but at the cost of his own life. Most of the characters of the otherworld come from folklore and the places actually exist.
