While visiting their grandparents' farm, Polly and Sam and their young cousin are drawn to an unusual rock that seems to want their help.
- ISBN10 0307555828
- ISBN13 9780307555823
- Publish Date 1 July 2009 (first published 1 November 1999)
- Publish Status Active
- Imprint Random House Books for Young Readers
- Format eBook
- Pages 51
- Language English