Today's big deal at Amazon UK is all six of Elly Griffith's Brighton Mysteries at £0.99 each:
https://smile.amazon.co.uk/s/ref=s9_...d_i=5400977031
Individually:
The Zig Zag Girl:
https://smile.amazon.co.uk/dp/B00L7SLUJY/
Smoke and Mirrors:
https://smile.amazon.co.uk/dp/B0118MR2UE/
The Blood Card:
https://smile.amazon.co.uk/dp/B01ARXVSPU/
The Vanishing Box:
https://smile.amazon.co.uk/dp/B01N0NG4NM/
Now You See Them:
https://smile.amazon.co.uk/dp/B07L98DZHJ/
The Midnight Hour:
https://smile.amazon.co.uk/dp/B08NP9XVWP/
I've read the first five and enjoyed them a lot. I've just bought the sixth.