The Auto Boys' Vacation is an adventurous tale following a group of boys as they embark on a vacation filled with unexpected challenges. Their journey is centered around the mystery of a stolen six-cylinder car, the Big Six. As the boys, including Billy Worth and Paul Jones, face a series of misfortunes, they also contend with the unsettling murder of their dog. Their search for the stolen vehicle leads them to an old man who shares eerie experiences about prowlers in his neighborhood. As the boys uncover more about the strange occurrences surrounding their car and the neighborhood, they grow more determined to solve the mystery. The narrative highlights the boys' camaraderie and their relentless pursuit of justice, blending suspense with the joy of youthful adventure. Through their efforts, the story captures the essence of friendship, determination, and the thrill of solving a mystery, all set against a backdrop of simple, nostalgic times.