Riding on the New York City subway, Molly and Sean exit into the Crystal Empire and join a giant tortoise on a mission to save the empire from the Firebrat.
- ISBN10 0394890086
- ISBN13 9780394890081
- Publish Date 12 May 1988
- Publish Status Remaindered
- Publish Country US
- Imprint Alfred A. Knopf Books for Young Readers
- Format Hardcover
- Pages 120
- Language English