Utterly classic Chalet School/EBD.
The underlying theme of this book is that a new English school opens across the lake from the Chalet School and an almost deadly rivalry springs up.
There are the usual mix of escapades and pranks, life-threatening illnesses, physically tough adventures and casual racism, all told in inimitable EBD style.
Please don't misunderstand me: I loved this series as a child and am loving them on adult re-read, but I can't avoid applying adult critical thinking.
There is an incident which involves pupils, including, of course, delicate Joey, being in the freezing cold water where the ice broke on the lake. I may be wrong, but it's actually quite unlikely that anybody would survive such an ordeal, and I'm not entirely sure that the first aid given to them would have helped eg heart massage during hypothermia? If they did have hypothermia, okay, we know they would, but it doesn't get mentioned.
Instead, they get pleuro-pneumonia and rheumatoid fever. Almost instantly on being rescued from the lake (and given hot baths and schnapps to recover). EBD was obviously blissfully ignorant of the germ theory of disease. It just disappoints me that Dr Jem, Gottfried Mensch etc were equally ignorant. I know it's easy to mock the pre-antibiotic age, especially when we have the internet to look up symptoms, causes and cures, but I just don't think EBD and her Editor were really that bothered about medical accuracy.
I also liked how a group of young teenagers, cut off by a landslip, hiked through a forest, up an Alpe and onto the Tiernsee Pass, in freezing cold winter weather. A casual aside that, on arrival at the Chalet School. the St Scholastika girls would rest before their 4 mile walk back to their own school. Yeah, that whole scenario was likely.
Casual racism - people behave according to their national 'types'. Non-British Europeans are seen as a different 'race' from Brits. A different race who can't really play games, like the Brits...oops, the 1928 Olympic Medal Table and the 11930 World Cup suggest otherwise - although, obviously we're talking mainly about men there, not jolly schoolgirls.
But if you have doubts about EBD's genius, I was taken aback by her description of Vera Smithers. I have read several books and many articles that attempt to explain sociopaths and psychopaths; EBD manages it just a couple of pages, in a description of this girl's character. She never mentions the word psychopath or sociopath; she probably didn't know them - I don't know when they came into common usage - but I feel that she was getting something off her chest, probably some awful girl she remembered from her own teenage years. That character description is EBD at her best!