Can you solve the History Mystery?
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.
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