One of a series of adventures featuring Hal and Roger Hunt. The boys are accompanying their zoologist father down the Amazon, to explore an uncharted river. They face the natural hazards of the jungle, hostile natives, an anonymous telegram, and a hunchback with bloodshot eyes.
- ISBN10 0381997324
- ISBN13 9780381997328
- Publish Date 1 January 1949
- Publish Status Out of Print
- Out of Print 18 March 2014
- Publish Country US
- Imprint John Day Company, Incorporated
- Format Hardcover
- Language English