I'm not a huge Patricia Highsmith fan, but lots of folks are, so...
Highsmith's classic
Strangers on a Train, which was a finalist for the 1951 Edgar Award for Best First Novel, is on sale at Kindle UK for £0.99.
Kindle UK:
https://www.amazon.co.uk/dp/B00HVF6UR4
Kindle UK/Smile:
https://smile.amazon.co.uk/dp/B00HVF6UR4