Kat and Allie have been friends forever. But when Allie returns from a summer away, everything changes. Allie’s different. Too different. And Kat begins to wonder: who is this girl and what has she done with her best friend?
When his little brother loses the class hamster, Marco Martinez comes to the rescue with a robot and some coding tricks. But will a robot rescue mission be enough to catch this speedy rodent?
After a hacker breaches the school’s grading system and gives students failing grades, Grady Hopkins wants to set the record straight. Along with coders Ava and Marco, Grady follows a trail of IP addresses as he searches for the perpetrator. Will they find the truth before everyone flunks sixth grade?
When weird noises in the school’s media center have students spooked, Marco Martinez is on the case. Marco writes up a code to alert him of any ghost-like activity. But does he have more than ghosts to be afraid of?
When Ava Rhodes’s brand new tablet computer goes missing, she’s desperate to solve the mystery. Can her fellow coding club members Marco and Grady and some quick coding help her? Or is everyone a suspect?
Sawdust in his locker and weird music on his MP3 player—someone is messing with Grady Hopkins. Determined to put an end to the pranks, Grady enlists friends Marco and Ava to help him decode anagrams left by the culprit. Will he solve the mystery before the trickster strikes again?