A brother and sister go back in time to the Ice Age and meet Neanderthals.
- ISBN10 061816412X
- ISBN13 9780618164127
- Publish Date 21 April 2003
- Publish Status Out of Print
- Out of Print 1 July 2021
- Publish Country US
- Imprint Houghton Mifflin
- Format Hardcover
- Pages 160
- Language English