Billie B. Brown and her friends; Jack, Mika and Alex, have decided to start a Secret Mystery Club and scour the neighborhood looking for mysteries to solve and clues to uncover.
In Treasure Hunt, Billie and the Secret Mystery Club have been given a very important mystery to solve for the principal at school. A long time ago, a time capsule was hidden in the school somewhere, and it's up to the SMC to find it!