What happened to Amelia Earhart? Was there really an ancient city called Atlantis? What caused the fire in the sky over Siberia in 1908? This book features 12 puzzling mysteries, some centuries old, that remain unsolved. Yet people today still wonder about them and try to find answers. Each story includes attention-grabbing photos and fascinating facts. Sidebars go beyond the basics, and prompts invite readers to think for themselves. Additional mini-stories encourage further exploration.
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?
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 a mysterious lunch thief leaves behind a card with a website address, Ava Rhodes can’t help but check it out. After the site leads her to a really boring online video game, she’s even more determined. Can GPS tracking help Ava and her friends find the thief? Or will more lunches go missing?
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?
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?