Have you read Grooshan Grange? It's a book by Anthony Horowitz which was published in late 80s. It was about a boy sent to a mysterious school to learn magic! ( Some people(including myself) say that Harry Potter is copied from Groosham Grange) Anyway, students disapeared in midnight of their birthday and after that day, they enjoyed the school! Same thing happends in Point Blanc( write spelling is with "c" not "k" )Students disapear in midnights and after that, they enjoy the school!
The chapters before school are a bit loose, Skoda and all that. I liked the way Alex refused to kiss Fiona " I prefer to kiss the horse! " But the chapters that happen in the school are realy fun, full of action.
The last chapther was annoying. you didn't know who have survived, Alex or Grif?( After Skeleton Key was published, I got my answer )
The part I liked the most was the night operation, with Wolf.
Point Blanc is much better than Stormbreaker, But if you read Groosham Grange before this, you know most of the story and it becomes loose for you.