Racing the Devil is the most recent (I think) Charles Todd "Ian Rutledge" mystery. And it's a good novel, despite being #19 in a series. (I always get a bit dubious as a series goes very long. I'm looking at you, "... in Death.")
In 1916, on the eve of the Somme offensive, 7 British officers meet at an ad hoc cantina in a barn, and while getting drunk, find that they are all from the southeast of England, and are all auto racing fans. They agree that if any of them survive the war, a year after the war ends they will meet in Paris and race their cars down to Nice.
Five of them survive to make the race, held in November 1919. But one of them ends his race in a terrible accident, and they go home not in triumph but a bit saddened.
Now, it is the autumn of 1920, and the police down in Surrey are concerned, because they have had an auto accident that makes no sense to them. The local rector died in a crash, but it wasn't his car; it was the local squire's. Also, there are traces of green paint on the rear of the car. Was the rector forced off the road? Why was he driving the car, in the first place? Was the "accident" not so accidental?
So they call in Scotland Yard, and the Yard sends down Inspector Rutledge. He must unravel a truly twisty tale, full of murder, attempted murder, blackmail, and kidnapping.
Partway through, I figured three or 3 1/2 stars for this one, but Todd managed to pull all the strings together very nicely and made a very solid finish. At least one evening I stayed up until "gulp" o'clock reading it.