I have never run into Christopher Bush as a mystery author, so I was pretty surprised when a title of his showed up in my recommendations with an interesting blurb, and when I checked on
SYKM, I discovered that he wrote a gazillion books, mostly featuring amateur detective Ludovic Travers, published from the 1920s to the 1960s.
The one that showed up in my recommendations at Kindle UK was £0.99, and there are nine others also at £0.99. These are sightly more at Kobo UK, and $1.99 at Kindle US.
I have no idea how good they are, and none of them have more than a few reviews, but I'll probably try one, just to check out the series.
Kindle UK link:
https://www.amazon.co.uk/gp/search/?...price-asc-rank