"The TimeRiders travel back to Robin Hood's Middle Ages to search for the mythical Holy Grail and to stop the future from changing"--
- ISBN10 0802734723
- ISBN13 9780802734723
- Publish Date 14 June 2016 (first published 16 October 2012)
- Publish Status Cancelled
- Imprint Walker Childrens
- Format Paperback (US Trade)
- Pages 448
- Language English
