When Asa and Rollo discover that Ragni, a sorcerer who has been chained to a rock by the evil Emperor Flood may know the fate of their parents, they set off in their invisible boat to find him.
- ISBN10 0375848088
- ISBN13 9780375848087
- Publish Date 22 July 2008
- Publish Status Out of Stock
- Publish Country US
- Imprint Random House Books for Young Readers
- Format Paperback (US Trade)
- Pages 77
- Language English