Mix some History with your Crime Fiction

I've participated in the Historical Reading Challenge hosted this year
Historical Fiction Challenge at Historical Tapestry
for the last 3 years and have surprised myself with how many historical books I have read so far this year, to the point that I have actually already completed the challenge I set myself.

Struggling the Addiction: 10 books
my extra rule: all need to be crime fiction. I expected that my extra rule might limit my reading a bit, but there is some good quality historical crime fiction available.
Here are the ones I have read so far.

1. 4.3, A LILY OF THE FIELD, John Lawton (World War Two)
2. 4.4, INSTRUMENTS OF DARKNESS, Imogen Robertson (England 1780)
3. 5.0, A FEW RIGHT THINKING MEN, Sulari Gentill  (Australia 1930s)
4. 4.4, THE MASK OF DIMITRIOS, Eric Ambler (Europe 1930s)
5. 4.6, THE COLD COLD GROUND, Adrian McKinty (N. Ireland 1981)
6. 4.7, DEATH COMES AS AN END, Agatha Christie  (Egypt 2000 BC)
7. 4.4, THE RESURRECTION MEN, Sara Fraser (England 1826)
8. 4.5, HAVOC IN ITS THIRD YEAR, Ronan Bennett (England in the 1630s)
9. 4.2, THE ANATOMY OF GHOSTS, Andrew Taylor (England 1786)
10. 4.5, MURDER AT THE SAVOY, Maj Sjowall & Per Wahloo (Sweden in 1960s)

There are a further two levels to the challenge

Severe Bookaholism: 20 books

Undoubtedly Obsessed: 15 books

and I think I will now set my sights on 20 books, particularly as this challenge overlaps so much with another, the British Books Challenge at the Overflowing Library, and even at times with the Vintage Mystery Challenge.