A new semester at Avengers Assembly brings a wave of unfamiliar faces, some of whom harbor sinister intentions. Kamala, Doreen, and Miles return to find their school populated by new teachers, but not all of them are who they seem. As confusion mounts over the new staff and their roles, a shadowy figure begins impersonating both students and teachers, sowing discord and deception. The students must uncover the truth behind these impersonations before the new generation of heroes is fractured from within.

The premise sets up a classic mystery within a superhero school setting, likely appealing to middle-grade readers who enjoy action and humor. The focus on student protagonists solving a problem suggests a narrative driven by teamwork and problem-solving, with a strong emphasis on character interactions. The introduction of villains disguised as staff creates immediate intrigue and a sense of urgency for the young heroes. The story appears designed to engage readers with its familiar Marvel characters in a unique educational environment.