THE BEEKEEPER'S BULLET, by Lance Hawvermale

Germany, 1917. A mesmerizing story of flying aces, feisty heroines, and death in the sky over war-torn Germany. When a British flying ace crash-lands his stolen plane near a German farm, American Ellenor Jantz, beekeeper on the farm, shoots first and asks questions later. She ought to turn the handsome pilot in, but something about Alec Corbin-Dawes instead makes her hide him in the farm's stables.
Alec is on a personal mission: to save his sister, who lives in Metz, which is scheduled to be hit by a massive air-raid in four days. He talks Ellenor into helping to start the plane he plans to steal from the German squadron based on the farm. In the pre-dawn process, as the plane taxis across the field, everything goes terribly wrong.
As usual, you'll get no spoilers here. It's a fun beach read, with a plethora of arcane facts about bees, "crates" as the pilots called their flying machines, and the intricacies of mid-air dogfights. There's also a charming but deadly villain, an underground anti-war cell, and a nice war-time love story. 
It's a 4. A fun read with some interesting historical tidbits and a fascinating in-depth look at the original fighter planes. Unsurprisingly, the author is a beekeeper.