The first three titles in Jake Needham's Samuel Tay series have dropped in price to $0.99/$1.99/$2.99 respectively at Kindle US, and £0.99/£1.99/£2.99 at Kindle UK. These are Kindle Countdown deals, good for more than five days still in each country. I've read and enjoyed all three of these. Note that the first title has been free briefly from time to time in the past, so check carefully before you buy!
The Ambassador's Wife, #1
Kindle US:
https://www.amazon.com/AMBASSADORS-W...dp/B006E8ZYPI/
Kindle US/Smile:
https://smile.amazon.com/AMBASSADORS...dp/B006E8ZYPI/
Kindle UK:
https://www.amazon.co.uk/gp/product/B006E8ZYPI/
Kindle UK/Smile:
https://smile.amazon.co.uk/gp/product/B006E8ZYPI/
The Umbrella Man, #2
Kindle US:
https://www.amazon.com/UMBRELLA-Insp...dp/B00ARITAC4/
Kindle US/Smile:
https://smile.amazon.com/UMBRELLA-In...dp/B00ARITAC4/
Kindle UK:
https://www.amazon.co.uk/gp/product/B00ARITAC4/
Kindle UK/Smile:
https://smile.amazon.co.uk/gp/product/B00ARITAC4/
The Dead American, #3
Kindle US:
https://www.amazon.com/DEAD-AMERICAN...dp/B00NREOKMA/
Kindle US/Smile:
https://smile.amazon.com/DEAD-AMERIC...dp/B00NREOKMA/
Kindle UK:
https://www.amazon.co.uk/gp/product/B00NREOKMA/
Kindle UK/Smile:
https://smile.amazon.co.uk/gp/product/B00NREOKMA/