In search of the mysterious element known as aether, Claire Dulac flew her hot air balloon toward the edge of our stratosphere—and never returned. Her husband

A year after his mother disappeared in her hot air balloon, Seraphin and his father receive a clue that sends them to a Bavarian castle where a force lurks that

Alex Alice's Castle in the Stars: A Frenchman on Mars is the fourth volume in a lavishly illustrated graphic novel series set in a world where space exploration

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The last school bell has rung and it’s finally HOME TIME! Even though they’re twins, Lilly and David don’t agree on much… except that the last summer be