"When the coding club finds that their app has a malicious user, Morgan, Zoey, and Daniel code an update to contend with a mischievous AI llama that's guiding a not-so-popular kid named Marcus to cause chaos in the school. Annoying little siblings, chaotic pranks, and more abound as they race to repair the glitchy app--and their own friendships--in their school before the damage is irreversible"-- Provided by publisher.