Ten mysteries for ten-year-old Encyclopedia Brown, his partner, Sally, and the reader to solve. Solutions are given at the back of the book.
- ISBN10 0525672109
- ISBN13 9780525672104
- Publish Date 1 September 1970
- Publish Status Out of Stock
- Out of Print 30 January 2010
- Publish Country US
- Imprint Penguin Books Ltd
- Format Hardcover
- Pages 96
- Language English