Sainsbury has C J Sansom's Matthew Shardlake series at £0.99 each at the moment in the UK.
http://www.sainsburysebooks.co.uk/co...r-one-day-only
Set in Tudor England, with Henry VIII on the throne, they follow the fortunes of a member of the bar. Excellent historical mystery stories. I've only read the first two so far, but highly recommended. If I hadn't already bought them, I'd buy them like a shot.
1. Dissolution
2. Dark Fire
3. Sovereign
4. Revelation
5. Heartstone
(Amazon UK seem to be matching the offer.)