The Drowned by John Banville, the fourth and latest Strafford and Quirke murder mystery, is £0.99 at Amazon UK and Kobo UK.
https://www.kobo.com/gb/en/ebook/the-drowned-4
https://www.amazon.co.uk/Drowned-Str...dp/B0D7K6NWVJ/
Christine Falls, the first Quirke mystery, which Banville published under the name Benjamin Black, is also £0.99.
https://www.kobo.com/gb/en/ebook/christine-falls-2
https://www.amazon.co.uk/Christine-F.../dp/B003DWC6K4