For Zed and Tuesday, adjusting to life in modern-meets-medieval Falinnheim means normal is relative. Lots of kids deal with moving, starting new schools, and doing chores. But normally, those schools aren't in underground bunkers full of secret agents, and the chore list doesn't involve herding dodos. The one thing that hasn't changed: all the adults treat them like they're invisible. When a security breach interrupts a school field trip, the siblings find themselves locked out of the Resistance base. With the adults trapped inside, it's up to Tuesday, Zed, and their friends to save the day. And for once, being ignored and underestimated is coming in handy. After all, who would suspect a bunch of kids are capable of taking down the intruders that captured their families, let alone the murderous dictator that put them into hiding in the first place? Turns out invisibility might just have its benefits.