Cosmo, a boy living on Mars, must come up with a quick solution when his malfunctioning robot Rex threatens his sister Jewel.
- ISBN10 0688159400
- ISBN13 9780688159405
- Publish Date 1 April 2000
- Publish Status Out of Stock
- Out of Print 18 October 2003
- Publish Country US
- Publisher HarperCollins Publishers Inc
- Imprint William Morrow
- Format Hardcover
- Language English