The Cameo Necklace (American Girl Mysteries (Quality))

Cécile loses her aunt's precious cameo necklace as she leaves a circus performance on a New Orleans showboat. Her search to find out who may have taken it leads her back to the wharf, to the French Market and Congo Square, to a high-society tea, and even into the cypress swamps outside the city. It also opens her eyes to the worsening challenges for people of color in the 1850s.