Billie and the Secret Mystery Club are investigating their most serious mystery yet. Someone has taken something from the principal's office at school! 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?
Series: A Billie B. Mystery
A slightly older Billie, her best friend, Jack, and other familiar friends from the original series, solve mysteries at school and in the neighborhood.