Ever since 12-year-old Tru Mitchell's dad died, she's been angry at the world. She struggles to deal with the fact that she doesn't fit in anywhere—especially not with her family. Her older sister Lia is a high school femme fatale, while her supergenius younger sister (and wrongly accused nemesis) Biz obsesses over completing the smart home system she designed with their father before he passed away.
All Tru wants is to escape into the world of The Lord of the Rings, her father's favorite series to read with her. She'd also love it if their greasy teenaged neighbor Milton could finally pass his driving test and stop endangering the lives of people, pets and innocent mailboxes everywhere.
When Tru jokingly suggests they hack Milton's car computer to help him pass his driving test, Biz creates a program to do just that, and it actually works. But when their mom and Lia fail to come home the next day, Tru starts to worry. Where is everyone? Why can't they reach 911 or the police? And honestly, why is Milton so flatulent and coated in orange cheese dust all the time?
Tru's not a supergenius and she doesn't want to be a femme fatale, but when Milton and his own smart home take Biz hostage next door, Tru learns one thing: if anyone's going to save Biz, Mom, and Lia, it has to be her.