THE DIAMOND KEEPER

French counterrevolutionaries attempt to finance war with the French Blue, one of Louis XIV’s crown jewels.

While most of France is rocked by revolution in the autumn of 1792, rural Brittany, where 19-year-old Claudie helps her harsh father run a village inn, is quiet until postman Jacques Lambert brings news that the crown jewels have been stolen. Claudie views her younger, prettier sister Mathilde’s infatuation with Jacques with a mix of distrust, envy, and resignation—her plain face and strong build mean her father wants to keep her for her labor. A few days later, their peaceful world is destroyed: Fleeing aristocrats take shelter at the inn, and the revolutionaries pursuing them burn the building down and go on a killing spree. Then Claudie discovers a large blue diamond and, dreaming of a normal life, travels to England with it on a risky secret mission. In reality, the gem resurfaced some 20 years later, recut as the Hope Diamond; Mobley’s story fills in the gaps enticingly. Claudie and Mathilde, in particular, are very finely drawn, with both girls able to make believable leaps from countryside to high society. The arc of the plot does falter at the end, however. Characters read as White; the Chevalier d’Éon, a real gender-nonconforming person from history, plays an interesting supporting role.

Compulsively readable, credible, and fun.