Mega Mindy, Grandpa and Grandma Fonkel, and Toby must solve the mystery of the sparkling emerald. There is a strange unknown man who wants to pay a lot of money for a painting that Grandma bought at the flea market. Grandma doesn't want to sell the painting, but then the candy store is broken into and Grandpa suddenly starts acting very strangely. When a new police officer unexpectedly starts working at the police station and more and more strange things happen, it's time for Mega Mindy to take action.