While visiting the Pony Express exhibit at the National Postal Museum, Kevin travels back in time and becomes Warren Upson, a famous rider with a difficult route.
- ISBN10 0606298649
- ISBN13 9780606298643
- Publish Date 1 January 2004 (first published 1 March 2003)
- Publish Status Out of Print
- Out of Print 28 May 2021
- Imprint Turtleback Books
- Edition Turtleback School & Library ed.
- Format Hardcover (Library Binding)
- Language English