"The Case of the Mysterious Voice" is a book from the "Hank the Cowdog Ser." series by John Erickson. Published by Penguin Publishing Group in 2011, this juvenile fiction book follows the adventures of Hank, the clever dog detective. With an emphasis on humorous and mysterious storytelling, the book features illustrations by Gerald L. Holmes and spans 144 pages in a Uk-B Format Paperback format. The story explores themes of animals, family life, farm and ranch experiences, and detective work, making it an engaging read for young readers interested in a mix of humor and intrigue.