Set in Paris during the Restoration, or as one of the characters calls it “The Great Forgetting.” Vidoq, founder of the plainclothes police and Hector Carpenter, a medical student become tangled up in tracking the fate of the Dauphin Louis-Charles. If found, he would become Louis the XVII, a problem given that there is now a Louis the XVIII. Just when they reveal the truth there‘s a great twist.
Thoroughly enjoyed this mystery.