The Time of the Missyl — Cheryl Scott Norman

In this second book in the Isshuayan Trilogy, Ali's mother, Jane, tells her daughter of her own time in the land of Isshuay... Isshuay's border has been breached by a Missyl, a mysterious, shape changing creature from a neighbouring land. Hopelessly lost in a hostile environment, the lonely Missyl is unwittingly contaminating the inhabitants of Isshuay as it searches for the way home. As the years pass, the land's goodness is slowly disappearing through the breach in the border. Anger and despair have replaced the happiness that once filled the land. Jane is selected by the fabulous Silver Ones as the one person who has the knowledge and skills to heal their land. Happily accepting the challenge, she travels with young Nestor across the Shimmering into Isshuay to begin her task of seeking the elusive Missyl and sending it home. She is joined by Old Marje and other intriguing characters as she discovers the dangers and the wonders of Isshuay.