Rebecca Cooper and the Ring of Isis

Rebecca Cooper is a fourteen-year-old witch. Orphaned at three, she is raised by two elderly aunts, who taught her the Wiccan way. She is sent to Ysgol Y Dewin, a school in another dimension, to learn the craft. While there, she discovers that she is the reincarnation of a witch called Gwynneth. Gwynneth was murdered by her sister Angharyd, two thousand years ago, when they fought for ownership of the book of shadows, presented to them by the goddess Astarte. The book, which only these two witches were able to read, held the secrets of everything in the world and would let the sole owner rule the world. Gwynneth hid the book before she died, along with some trinkets which held clues to the whereabouts of the book. Rebecca has to find these trinkets before Angharyd does, in order to stop evil ruling the world. Will she succeed?