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.
Workers discover a time capsule at Lincoln Elementary, but it’s locked! What could be inside? Whoever made it left a trail of geometry clues based on shapes. Be a math detective along with the kids at Lincoln Elementary and help solve this pick-your-own-path mystery. At Lincoln Elementary, the student detectives love solving mysteries! Can you help them solve the clues to open the time capsule? Choose the right answer, and advance to the next clue. Choose the wrong answer, and clear text and visuals explain the math and encourage you, the reader, to try again.
Who took the cookies? Be a math detective along with the kids at Lincoln Elementary in this pick-your-own-path mystery. Be a detective and use your addition, subtraction, and skip counting skills to solve the case. Things keep going missing at Lincoln Elementary. And the student detectives there love solving mysteries! Can you help find the missing cookies? Choose the right answer, and advance to the next clue. Choose the wrong answer, and clear text and visuals explain the math and encourage you, the reader, to try again.
When items go missing from the school store at Lincoln Elementary, the kids check their data to solve the case! Be a math detective along with the kids at Lincoln Elementary and help solve this pick-your-own-path mystery. Use data, graphing, and math skills to find the culprit. Things keep going missing at Lincoln Elementary. And the student detectives there love solving mysteries! Can you help find school store thief? Choose the right answer, and advance to the next clue. Choose the wrong answer, and clear text and visuals explain the math and encourage you, the reader, to try again.
Mrs. Hall’s desk is overflowing with new pencils! But why are there so many? Be a math detective along with the kids at Lincoln Elementary and help solve this pick-your-own-path mystery. Use your math skills and knowledge of place value to solve the case. At Lincoln Elementary, the student detectives love solving mysteries! Can you help them solve the pencil problem? Choose the right answer, and advance to the next clue. Choose the wrong answer, and clear text and visuals explain the math and encourage you, the reader, to try again.
Oh no! Lucky, the class pet, has escaped! Where did he go? Be a math detective along with the kids at Lincoln Elementary in this pick-your-own-path mystery. Use math and measurement skills to figure out where Lucky could be hiding. Things keep going missing at Lincoln Elementary. And the student detectives there love solving mysteries! Can you help find the missing class pet? Choose the right answer, and advance to the next clue. Choose the wrong answer, and clear text and visuals explain the math and encourage you, the reader, to try again.
In this pick-your-own-path mystery, four kids at Lincoln Elementary are invited to complete a math challenge at the school carnival. But who set up the clues? And why? Be a detective and use your money math skills to solve the case. At Lincoln Elementary, the student detectives love solving mysteries! Can you help solve the carnival clues? Choose the right answer, and advance to the next clue. Choose the wrong answer, and clear text and visuals explain the math and encourage you, the reader, to try again.
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?
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 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 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?
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 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?
Filming a sprint car race on the local track, Dylan Clarke captures racer Carlee Martin’s fiery accident. The more Dylan replays the video, the more he believes that there’s something suspicious about the crash. As he investigates, Dylan discovers that some of Carlee’s fellow racers might have wanted to hurt her. And, now, they’re after him too.
Years in the future, the world is in the midst of an energy crisis. Best friends Liam and Grace spend their evenings sneaking around abandoned buildings. One night, they spot a man wandering in the deadly radiation zone. How can he survive? Is he an alien? A zombie? Liam and Grace have to find out.
Michael suffers from a mysterious and painful lung disease. But he’s thrilled when a charity foundation grants his last wish—to visit the world’s only deep-water hotel. Submerged miles below the water’s surface, Michael discovers horrifying sea creatures, and a shocking secret is revealed.
Drew thought spending the summer in Florida with his little sister Maddie was the worst thing that could happen to him. He was wrong. When their plane crashes in a swampy, crocodile-infested wilderness, Drew and Maddie must rely on each other to survive.
For as long as he can remember, Hal Crabtree’s family has owned Limbo’s Diner. The patrons of Limbo’s are unique—they are dead, waiting for their final judgment. When Hal’s classmate Gwen shows up at the diner, Hal is determined to solve the mystery of her death. If he fails, the diner’s about to get full real quick.
Ever since the car accident that killed his father, Ben Kirby’s life has been a mess. Then, one day Ben stumbles across Second Chance Delivery, a service that will send an object and a letter to his past self. Now, Ben has one chance to stop the accident and change his future before fate takes its course.
Presents stories of crop circles, designs that appear in crop fields, often overnight. Examines the evidence of various explanations.
Presents stories of the Loch Ness monster in Scotland, examining the evidence of various explanations and hoaxes surrounding this legend.
