Cam Jansen and the Millionaire Mystery. Cam Jansen #32 - David A. Adler

Cam Jansen and the Millionaire Mystery is the 32th book in the Cam Jansen Series. Mysteries follow super-sleuth Cam Jansen everywhere she goes... even to a charity event. Cam and Eric are at a benefit with their mothers to raise money for local firefighters. When the host's pearl necklace goes missing, the luncheon turns into a whodunit, and all the guests are suspects. Can Cam use her photographic memory to identify the culprit before the thief gets away?