After learning about Sherlock Holmes, Humphrey the classroom hamster follows clues to try to discover why Mrs. Brisbane is gone and Mr. E, a fun but not very educational substitute, is taking her place in Room 26 at Longfellow School.
- ISBN10 0399254145
- ISBN13 9780399254147
- Publish Date 5 July 2012 (first published 31 January 2012)
- Publish Status Remaindered
- Publish Country US
- Imprint Putnam Publishing Group
- Format Hardcover
- Pages 146
- Language English