Most of the readers of this rather short novel will be P.G. Wodehouse's fans wanting to explore his early literary career. They may be disappointed because they won't find the wittiness and humor of his Jeeves novels. That's not what this story is about. This is a plot-oriented story, working around two themes: sports and boarding school fiction. As one reviewer said, it's odd to be cheering at the conclusion of a Wodehouse novel, instead of grinning wryly.
Wodehouse was following here the tradition of British school fiction popularized in Victorian times by Thomas Hughes (Tom Brown's Schooldays) and Frederic W. Farrar (Eric), and developed by the likes of Talbot Baines Reed (The Fifth Form at St. Dominic's, and others). This book comes later than the ones I mentioned, in Edwardian times, and by then the style of the genre had changed to focus more on athleticism and less on moralizing.
The story takes place in a boarding school called Wrykyn. The first chapter is less cohesive, because we meet a few characters that don't really play a relevant role in the story. The objective of the character is providing continuity with a previous novel set in the same school (The Gold Bat), by showing where the main characters of that novel are now, and also to establish that after a year of great success for the school on the sport fields, students have graduated and the school sport teams are going through a mediocre period.
Very soon the story starts properly with the introduction of Sheen, a senior boy who focuses more on his studies than on sports or social activities, and therefore is not particularly popular among his schoolmates. At the time, there are a lot of fights among Wrykyn's boys and the boys of a rival school and also town youths. During one particular fight in town, Sheen runs away instead of helping his schoolfellows, in a public display of cowardice that turns him into a social pariah in the school (he is sent to Coventry, which means that everyone refuses to talk to him). He is also not happy about his own behavior, so in a misguided attempt to make amends he goes to the town alone and ends up getting beat by the toughest of the town youths. However, the beating is interrupted when he is rescued, Mr. Miyagi style, by a curious gentleman who turns out to be an ex-boxing champion.
On finding that said gentleman now makes a living by giving boxing lessons, Sheen engages his services, and starts learning to box in secret. He proves to have talent for boxing and soon becomes quite competent. However, he continues being ostracized at school, false rumors about him are spread and he doesn't find the occasion to prove himself. For different circumstances he can't compete in the inter-school boxing competition, so his last chance of redeeming himself and regaining the steem of his peers before graduating may be Aldershot, a prestigious, high-level boxing event where the best public school boxers from all the country compete.
This is therefore a sporting underdog story. Think Karate Kid in a boarding school, only with boxing. But beyond the sport, it's a story about a young man losing and regaining the respect of his peers. Wodehouse, of course, even though this is very early in his career, is one of the most talented writers to write in this genre, second only to Ruyard Kipling. His characterization and dialogue is good and there are a few funny moments. Apart from Sheen, I quite liked Drummond, the strong but kind-hearted boy who was the school's best hope for Aldershot but is unable to compete because of an illness. There are some secondary plots but mainly it's a very straightforward tale, and one that I enjoyed thoroughly, being a fan of the genre.