Gifted Girls.
Daring Dames.
Marvelous Mysteries.

The Secret Spy Society is back with a new case to solve!

Peggy, Rita, and Dot are practicing for the upcoming band concert. But when the school's instruments start to disappear one by one, their big performance is in jeopardy. With the help of some secret codes and the most enigmatic women in history who worked as spies, with the girls be able to solve the mystery and face the music?