While staying with his grandparents in Castle-on-the-Hudson, Charlie stumbles upon a mystery but must learn American Sign Language to keep up with Frog, a deaf girl who wants to help solve it.
- ISBN10 1368005829
- ISBN13 9781368005821
- Publish Date 10 April 2018
- Publish Status Active
- Publish Country US
- Publisher Disney Book Publishing Inc.
- Imprint Disney Press
- Format Hardcover
- Pages 256
- Language English