Oxford Bookworms: The Whispering Knights

This story begins innocently enough as three children—William, Susie, and Martha—decide to make a witch's "brew" in an old barn near their village of Steeple Hampden. However, their game is far from harmless, as it accidentally awakens something dark and powerful from the distant past: the evil witch Morgan le Fay. The children must rely on their courage and the help of local folklore and ancient stones known as "The Whispering Knights" to fight Morgan and save their village from her evil power.