Josephine Tey’s The Franchise Affair is £0.99 right now at Kindle UK. I found my way to Tey’s writing via her Ricardian mystery, The Daughter of Time, which I loved. But I then really enjoyed working my way through her other books, including this non-series title, which is kind of a classic. I just wish she had published more books!
Keep in mind that this is also available for free from Faded Page, Project Gutenberg Canada, and probably some other PD websites too, if you are lucky enough to be in one of the countries where copyright laws put it already in the public domain.
Buy at Kindle UK