On a rainy day two brothers try to discover who is playing the harmonica they hear in their apartment building.
- ISBN10 0808566768
- ISBN13 9780808566762
- Publish Date 24 May 1999 (first published 1 January 1977)
- Publish Status Out of Print
- Out of Print 12 July 2022
- Publish Country US
- Imprint Turtleback Books
- Edition Turtleback School & Library ed.
- Format Hardcover (Library Binding)
- Pages 40
- Language English