They’re multiplied and divided. They’re spectacular and average. What are they? Math mysteries, of course! Get ready to crack the cases and the real math in

"Nonfiction history information is presented as mysteries for readers to solve. With the turn of a page, readers learn how to solve the true history mystery"--P

They’re explosive and invisible. They’re extinct and never ending. What are they? Science mysteries, of course! Get ready to crack the cases and the real sc

They’re furry and funny. They’re tracked and tricky. What are they? Animal mysteries, of course! Get ready to crack the cases and the real animal info wide

Boo! There is a mystery behind every door of the creepy haunted house. Luckily, algebra will help you solve each problem. By using simple addition, subtraction,