Nightmare+Academy

=Nightmare Academy=

Whats the book about?
====//The book is about a boy called Charlie who finds a portal to the netherworld in his school. He goes through the portal and then it closes. The only way out is to get to the centre of that world and find another portal. But to get there he has face all the monsters that lurk there, like hydras, witches and overgrown fish.//====