Title: Alvin's Secret Code
First published: 1963
Description: Twelve-year-old Alvin and his best friend Shoie use their knowledge of codes and ciphers to solve a dangerous mystery.
Subjects: Fiction, Mystery and detective stories, Buried treasure, Ciphers, Detective and mystery stories, Treasure troves, Juvenile fiction, Conduct of life, Youth, Code and cipher stories, Friendship, Children's fiction, Buried treasure, fiction