After discovering the truth about her spy school/boarding school--and her super-spy mom--Abby Hunter is ready for her next adventure, but what's about to happen is something she never would have guessed...

Everyone at The Smith School is obsessed with Monster Mayhem, the latest reality video game craze. But when Drexel Caine, the mastermind behind the game, is suddenly kidnapped, it becomes clear that the kidnappers are playing for more than just special badges.

After Drexel's son--who is Abby's friend, Toby--receives a cryptic message, Abby and her friends discover the kidnapping is part of a bigger scheme that could take down The Center for good.

With the help of Abby's frenemy (and reluctant mentor), Veronica Brooks, the group tackles their first official Center Mission. They tangle with the world's most notorious hacker, get in trouble for the possible theft of the Mona Lisa, and prepare for the ultimate showdown in London. But not before they have to contend with one more hurdle: the agonizing Smith School Spring Formal. Along the way, they discover they are much stronger as a team than they can ever be alone.

And with a little luck, they might just save the world.