The French girl - Lexie Elliott

They were six friends (and sometimes more than friends) spending an idyllic week together in a French farmhouse. It was supposed to be the perfect summer getaway... until they met Severine, the girl next door. For Kate Channing, Severine was an unwelcome presence, her inscrutable beauty undermining the close-knit group's loyalties. After a huge altercation on the last night of the holiday, Severine was never seen again. Now, a decade later, the case is reopened when Severine's body is found in the well behind the farmhouse and Kate finds herself buried under layers of deception.