"The River Motor Boat Boys on the Amazon; Or, The Secret of Cloud Island" by Harry Gordon is a fictional adventure novel written in the early 20th century. The story follows a group of four boys, Clay, Alex, Case, and Julian, who are embarking on an exciting journey to the Amazon in their motorboat, the "Rambler". The boys, all orphans, have saved up money to fund their trip with the primary goal of helping their sick friend Jule recover. At the start of the narrative, the boys have prepared for their journey and are waiting for Jule to return to the cabin of the boat after leaving to keep watch. Tension builds as the boys discuss various worries upon realizing Jule is missing, particularly concerning the safety of their money that has been left unattended. When Jule finally comes back, the boys learn that their money has mysteriously disappeared. This sets the stage for a series of adventures filled with peril, intrigue, and the challenges of navigating the Amazon as they uncover secrets and confront dangers related to both their missing funds and their health. The opening introduces the central characters and hints at the dynamics of their friendships, along with the themes of adventure, camaraderie, and resilience against adversity. (This is an automatically generated summary.)