Lost lands of Witch World

the long version

"Three Against the Witch World: Kyllan, Kemoc, and Kaththea, the triplet children of Simon Tregarth and Lady Jaelithe, pursued by tyranny, escape their embattled homeland, fleeing to the mysterious East. But in this land new to them, the three discover their presence has rekindled the evil forces of the land." "Warlock of the Witch World: Kaththea is enslaved by an evil warlock who takes her far from her brother. When Kemoc tries to rescue her, he must reverse fearful foretellings in order to save his sister's life. But even if he can, she might be changed forever, breaking the bond of the three." "Sorceress of the Witch World: Separated from her brothers by an avalanche that almost kills them all, Kaththea must find her way back to them through trails and adventures that tax her diminished strength. To survive, she summons an ancient power and will need the help of Hilarion and the spirits of her parents to regain her lost world and renew the bond between her brothers and herself."--BOOK JACKET.