Nemesis: Book Three of Zach's Story (First Edition)

Zach and Sophie leave Lamington Primary to begin their secondary education at the prestigious Josiah Batty Grammar.  Here Zach is stalked by the pipe-smoking, armchair-travelling ghost of the school’s founder, Josiah Batty.  The ghost is looking for someone (a ‘cat’s paw’) to help him expose the dealings of the headmaster, Henry Pettigrew.  Pitting himself against the headmaster on Josiah Batty’s behalf isn’t Zach’s idea of a good thing to do.  Nevertheless, he, Sophie and Drew, with the help of Astra and the twins, become detectives.  They do discover what the headmaster is up to, but what are they supposed to do with this information?