Billy Bunter and the Secret Enemy Vol 1

There's a secret enemy at Greyfriars

Who is the secret enemy and why is he targeting Wharton? Who has stolen the five-pound note? Who has been smoking in the Study No. 1? Who has been meeting shady bookmakers? All evidence seems to point to Bunter's Form captain Harry Wharton. What is the new schoolboy Arthur da Costa's role in all this? Why does he want to get Wharton expelled? Da Costa's cunning and Inky's counters take the thrilling story along to a finale at a cricket match and of course Bunter is there in the midst of it all.