Emilie and the Hollow World by Martha Wells

Hoping to stow away on the local ferry, Emilie crawls onto Lord Engal’s private steam yacht. She is quickly caught up in an expedition to hunt for a lost airship, its inventor, and its crew, which have disappeared into the interior of the world. This old-fashioned young adult adventure follows the daring Emilie and other rescuers as they search for their friends and attempt to escape from their enemies. Along the way, Emilie discovers the courage to solve her problems both in the hollow world and at home. Ages 12 and up. (Strange Chemistry)

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