After the Armistice Ball by Catriona McPherson, 477 pages

If you like your mysteries utterly British, this is a must read. I'm a little bit of an Anglophile when it come to my mysteries, and I found myself having to google different things that I'd never heard of. The mystery dragged just a little in one or two places, but it was still a pretty good read.
Dandy Gilver is trying to find her place in life after the end of WWI, her war work over, husband home, and the stiff upper lip that can now be relaxed. When she's asked by a fellow society matron to look into the disappearance of the Duffy diamonds, little does she expect it to lead to murder. But Dandy is determined to get to the bottom of the mystery, no matter what.