A big batch of Edward Marston's Railway Detective titles are on sale right now at Kindle UK, mostly for £0.99 each, and a couple for £1.99 each (indicated below)...
- The Excursion Train, #2: https://www.amazon.co.uk/dp/B006WB7MC0
- The Railway Viaduct, #3, £1.99: https://www.amazon.co.uk/dp/B006WB7MXO
- The Iron Horse, #4, £1.99: https://www.amazon.co.uk/dp/B006WB7ONM
- The Stationmaster's Farewell, #9: https://www.amazon.co.uk/dp/B007XF8GM4
- Peril on the Royal Train, #10: https://www.amazon.co.uk/dp/B00BOE1DJ8
- Signal for Vengeance, #13: https://www.amazon.co.uk/dp/B01E5LHD7C
- The Circus Train Conspiracy, #14: https://www.amazon.co.uk/dp/B06XXVTSD3
- A Christmas Railway Mystery, #15: https://www.amazon.co.uk/dp/B07521JS5M
- Points of Danger, #16: https://www.amazon.co.uk/dp/B079SWNSRR
- Fear on the Phantom Special, #17: https://www.amazon.co.uk/dp/B07RD4G8GV