Secrets of the Scepter — Mary Stanton

CHASING THE INDIGO STAR
With the Royal Scepter in Princess Arianna's possession, the balance of magic has finally been restored. Now hope of defeating the evil Shifter is spreading throughout Balinor. But first Arianna must learn how to control the Scepter's mystical power.

As her pilgrimage to discover the secrets of the Scepter begins, the Princess is faced with many dangers. She must move quickly before the Shifter's next evil attack. If only she could reach the Celestial unicorns and uncover the truth of the ancient magic...