I was worried that I wouldn't like this book because of my disastrous encounter with Venetia, one of Heyer's regency romances, but this was pretty good.
Mr. Frank Amberley, a barrister visiting his relatives in the country, comes across a man shot dead in a parked car with a woman standing alongside whilst trying to following his cousin's poor directions for a short cut. He reports the murder but doesn't mention the woman because he strongly believes she didn't do it and doesn't trust the local constabulary not to try to pin it on her by mistake, apparently. You could easily accuse him of arrogance, I suppose, but he does seem to be a clever man.
This kicks off an amateur investigation where Amberley liaises with the police without telling them everything. I didn't guess the solution to the mystery although I had an inkling about part of it. I enjoyed the dialogue the most, I think. There was a lot of clever talking or whatever you want to call it, where characters don't exactly say what they mean but you follow along anyway, or characters mock each other without the author having to come out and say it. Or maybe others wouldn't say it was like that at all but I had fun with it regardless.
The last summing up chapter could have been a teensy bit shorter, but overall it was fun.
I read this for the "Terrifying Women" square for the Halloween Bingo but it could work equally well for "Murder Most Foul" and "Amateur Sleuth". It may work for "Country House Mystery" as well, although the number of suspects isn't quite as limited as some country house settings although you are still limited by being in the country.