The Forgotten Isle — L.E. Engler

Before Arthur was king, the legendary ruler of Britain, before the Round Table, before Lancelot and Guinevere... Arthur finds himself transported back to 2200 B.C., the Bronze Age. An evil power has entered the Emerald Isle and Finias is under attack. The people are being hurt and killed, and the villagers flee from the demon power. Danu, the Earth Mother, is sworn to protect her people, but she has run out of ideas. So she reaches 2700 years into the future and transports young Arthur of the Britons to her time. Someday Arthur will unite all of England and be king, but right now he is only 12. Does he have the knowledge and power needed to save her people?