Sonia, Pedro and their classmates are baffled. Mysterious messages keep popping up on their computers, on their mobile phones, on websites they visit, even on a radio programme they listen to. It is a voice from the past - but who is trying to contact them from out of history, and why?
Follow the clues from their school in modern-day Brazil through the ages to ancient Egypt, to a medieval wizard's castle laboratory and to the ships that sailed from Europe to discover the New World. Can you solve the History Mystery?
All of our books are second hand, and while you may not get the exact copy shown in the picture, all of our books are in very good condition. Removing stickers from a book may damage it, so we refrain from doing so. If you see a price sticker on a book, please ignore it.