Billie and the Secret Mystery Club have been given a very important mystery to solve for the principal at the school. A long time ago, a time capsule was hidden in the school somewhere, and it's up to the SMC to find it!
- Series:¬†Billie B. Mysteries
- Paperback:¬†96 pages
- Publisher:¬†Kane Miller/ EDC Publishing (2015)
- Product Dimensions:¬†5.3 x 0.3 x 7.8 inches