Jacqueline Winspear's Amy Dobbs series ... set in the 1930's in London are ab fab
http://store.kobobooks.com/en-in/Sea...eline+winspear
I second those who mentioned Louise Penny's Inspector Gamache, and Martin Walker's Bruno Courreges series.
http://store.kobobooks.com/en-in/Sea...y=louise+penny
http://store.kobobooks.com/en-in/Sea...=martin+walker
All Kobo couponable depending on the country you choose to shop in.
(And there's another Contest on at the moment - yep - back to back contests by Kobo

)