Everything at Ella Mentry School is suddenly breaking down, and even the teachers are completely losing their minds! Luckily, the school has a secret weapon. Mr. Harrison is the ultimate tech guy, and he can fix absolutely anything, from glitchy computers to broken phones and jammed pencil sharpeners. You will be amazed as he builds wild new inventions, including an umbrella powered completely by the sun. But when a massive power outage plunges the entire school into total darkness, the halls instantly erupt into yelling, screaming, and hilarious chaos. You and A.J. will have to navigate the frantic madness in the dark while hoping the tech guy can work his magic. Will Mr. Harrison be able to fix the school before the students totally take over? Join the gang for a laugh-out-loud chapter book packed with wacky technology, silly freak-outs, and incredible fun.