A family of scientists is on the brink of a powerful discovery when a mysterious force suddenly abducts them, leaving their young daughter April behind. Years later, April carries on her family's research in secret with her cat, Darwin, but soon finds herself at the center of a shadowy conspiracy and on the run from government agents, bicycle-powered airships, and cyborg rat spies!
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It's 1941 but France is trapped in the nineteenth century, governed by steam and Napoleon V, where scientists vanish mysteriously. Avril , a teenage girl, goes in search of her missing scientist parents.