The characters in Highland Pony Trek aren't the convention sort who believe that if they work hard everything will work out. There's much more failure than is usual in a pony story. Elder sister Fiona is inclined to give up, and gets bored with the whole trekking idea half way through.
You can see in this book the germination of the themes Patricia Leitch was to explore at length in the Jinny series: the danger of having too much money, which insulates you from the natural world, and the real difficulty of making your way in a world which view you at best dispassionately.
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