Eerie Elementary seems to be falling down around the students and teachers, so Principal Winik decides the school must be torn down, but Sam, Lucy, and Antonio suspect that somehow this is all part of Orson Eerie's evil plan to live forever--and if it is they must find a way to prevent the demolition.

Eerie Elementary is planning a big Halloween-type celebration for Eerie Day, including hosting a "haunted house" at the school itself; but the spirit of the evil scientist Orson Eerie sees this as the chance to finally triumph over the intrepid hall monitors, Sam, Lucy, and Antonio--and it is up to them to prevent a catastrophe and perhaps even defeat Orson and banish him from the school forever.

Inspired by real-life makers Ada Lovelace and Marie Curie, this beloved #1 bestseller champions STEM, girl power and women scientists in a rollicking celebration of curiosity, the power perseverance, and the importance of asking "Why?" Don't miss Ada's further adventures--with her friends Iggy Peck and Rosie Revere--in the instant New York Times bestseller Rosie Revere and the Raucous Riveters, the first all-new chapter book starring The Questioneers!...