When 12-year-old Saffi and her 10-year-old brother Oliver discover a puzzling antique pocket watch in their grandparent's attic, they accidentally activate its mysterious powers and get whisked back in time to World War 2-era London! There, they come face to face with their grandfather William as a young inventor in 1940s Britain, working secretly with the government to crack enemy communication codes and invent a powerful time machine to help the Allies. But when William is kidnapped by devious Nazi spies, Saffi and Oliver have to leap into action to rescue him. Aided only by their wits, courage, and the cryptic clues William left behind, the siblings race against time to stop these evil agents from changing history as we know it. Kids who love history, cracking secret messages, solving mysteries, outsmarting villains, and pulse-pounding time travel adventures will speed through this exciting page-turning tale. Can two ordinary kids save their grandfather and defeat the Nazis? Or will sinister spies succeed in their plans to rewrite the past and alter the future?
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