Agnes Wilkins is standing in front of an Egyptian mummy, about to make the first cut into the wrappings, about to unlock ancient (and not-so-ancient) history.

Maybe you think this girl is wearing a pith helmet with antique dust swirling around her.

Maybe you think she is a young Egyptologist who has arrived in Cairo on camelback.

Maybe she would like to think that too. Agnes Wilkins dreams of adventures that reach beyond the garden walls, but reality for a seventeen-year-old debutante in 1815 London does not allow for camels--or dust, even. No, Agnes can only see a mummy when she...