Can you help Sx4 Agent N solve the mystery?Zombies are on their way to attack the school. Only Sx4 Agent N has the skills and training to stop them. Will Sx4 Agent N be able to stop the zombies before they break through the school gate and cause havoc? Find out now in this suspenseful, action-packed mission.Children's Picture Book Ages 4-7This fun children's picture book, full of colour and rhyme, tells the story from the perspective of the secret student spy as they try and solve the mystery. The gender and identity of the spy is hidden, allowing your child to imagine themselves in the story. This is a great bedtime story as your child can drift into slumber dreaming of saving their friends and teachers at school.Each book in the series comes with a new clue to the identity of the spy. Visit the Secret School Spy Squad website with your child to try and guess who is Sx4 Agent N.