Proctor Middle School just built a new state-of-the-art theater, and Elise, Peyton, Lily, and Charlie are excited to be working on its first production. Then, the four friends find an old-fashioned suitcase full of secret spy gadgets, and a mysterious note that says, "Use what you find. Employ your powers for good causes, not evil deeds. Together you will solve many mysteries." When it appears that someone is trying to sabotage the play, it's up to the girls of the brand-new Spy Society — and its honorary canine member, Bowser — to unravel the mystery! Helpful spy tips and a fast-paced story will get budding secret agents started on their spying careers!