Tracy Doyle is amazed by the overwhelming excitement in Canton when she is sent to report on the grand opening of the Museum of Wonders. But the real talk of the event is about a wealthy tech magnate and his unique donation to the museum. From his own private collection, Grover Glenn has given the museum a purple quahog pearl ring. This rare and very expensive treasure is sure to be a hit among museum visitors. But when the cloth on the display case is lifted--the ring is gone! Worse, security footage shows Tracy's six-year-old niece, Jana, opening the case. Despite the evidence, Tracy knows her sweet niece is innocent, especially when they can't find the ring in Jana's possession. So the question remains -- who really took the ring? Meanwhile, rushing to get things done at home, Tracy trips and hurts her ankle. The injury puts a screeching halt to her never-ending to-do list. How is she supposed to solve the mystery of the missing pearl ring from an armchair?