"The Mystery Boys and the Secret of the Golden Sun" by Van Powell is an adventurous novel written in the early 20th century. The story follows Tom Carroll and his two friends, Nicky and Cliff, known collectively as the Mystery Boys, as they embark on a quest to uncover the mystery surrounding Tom's missing sister, Margery. As they delve deeper into their investigation, the boys encounter danger, deception, and unexpected allies, setting the stage for thrilling escapades. At the start of the story, the three friends are in Mexico, discussing their ongoing search for clues about Tom’s sister, who disappeared during a bandit raid several years prior. They encounter a rough-looking man named Henry Morgan, who claims to "smell money" and offers cryptic information about a "golden mountain," suggesting a possible connection to their search. The boys are intrigued yet cautious, and after a tense interaction, they strike a deal with Morgan, eager to learn more. As their adventure unfolds, the narrative builds anticipation, promising readers a mix of mystery and excitement as they navigate through the challenges that lie ahead. (This is an automatically generated summary.)