A Knight of Change
Adrian Maudling, author
Mark and Allison are twins who are thrust into a magical life they never knew existed. They discover their mother was a Grail Knight and upon her death they receive her abilities. They then have to deal with new abilities and a new life. Unfortunately they are also in the middle of a battle for power between the knights and an unknown enemy. After a number of adventures and trials the enemy is revealed along with some other secrets.