The Guardian of Lies by Kate Furnivall

The Guardian of Lies is a Cold War thriller set in the South of France. A young woman, Eloïse, goes to Paris, hoping to follow in her brother's footsteps as a CIA agent. After a car chase, where her brother is severely injured, she goes home to her family's farm in the South of France, only to find that the area has become a hotbed of violence and political intrigue after her father sells part of his land to the U.S. Air Force for an airbase. And she begins to suspect her brother...