Witch Week by Diana Wynne Jones

Witch week is the third book of the Chrestomanci series. It all starts when Mr crossley gets a note. The note says “Someone in this class is a WITCH! Witches are not allowed in this world so Mr crossley is very upset. Who is the witch you ask? Keep reading to find out! Witch Week is a children’s fantasy novel and school story by the British writer Diana Wynne Jones.