Another Joffe Books freebie - this time from their imprint, Lume Books...
Sue for Mercy, by Veronica Heley, is, per the author's website, a re-release in e-book of a 1974 stand-alone mystery/thriller.* *I haven't read this one, but have liked some of Heley's other books.**
Kindle US:
https://www.amazon.com/dp/B0CH47LNVQ
Kindle UK:
https://www.amazon.co.uk/dp/B0CH47LNVQ