Stolen Stash - Billie and the Secret Mystery Club are investigating their most serious mystery yet. Someone has taken something from the principal's office! Who would have done such a terrible thing? And when one of Billie's friends becomes a suspect, will Billie even know who to trust anymore?
Treasure Hunt - Billie and the Secret Mystery Club have been given a very important mystery to solve for the principal. A long time ago, a time capsule was hidden in the school, and it's up to the SMC to find it!