Earth's magic

Heather and Merlin are working with King Arthur to unite Britain following a terrible nuclear devastation. Merlin's sworn enemy, Morgan Le Fay, is also organizing her forces, hoping to take over the world once and for all. Earth's only hope is for Merlin to find his father, who has been trapped in an enchantment for two thousand years. The problem is, Merlin doesn't know where to look, and worse, doesn't even know what form the enchantment takes. Time is running out and Merlin and Heather must solve the ancient mystery and return with the key to the Earth's magic. Traveling to one of the origins of humanity, the ancient kingdom of Kush, Merlin must decipher the key before the summer solstice when a great battle will be waged to decide the future of the earth.