Three children on a holiday in Cornwall find an ancient manuscript which sends them on a dangerous quest for a grail that would reveal the true story of King Arthur.
- ISBN10 015259034X
- ISBN13 9780152590345
- Publish Date 20 April 1966 (first published May 1965)
- Publish Status Out of Stock
- Publish Country US
- Imprint Houghton Mifflin
- Format Hardcover
- Pages 252
- Language English