"Trouble on Sun-side" by S. M. Tenneshaw is a science fiction novel written in the mid-20th century. The story follows Frank Jansen, who arrives on Mercury in search of answers about his brother's mysterious death while entwined in a conspiracy involving the control of a crucial agricultural resource for Earth. The setting of Mercury, particularly the "twilight zone" where Jansen finds himself, serves as a backdrop for the tension and intrigue as he navigates a world where he is both a hunter and the hunted. In the narrative, Jansen quickly discovers that his brother was killed by a powerful figure named Bareen, who is orchestrating a plan to monopolize the production of chlorella, a vital food source for Earth's population. Jansen meets Wendy Hilliard, who reveals crucial information about the conspiracy, suggesting that Bareen's control over the irrigation systems and transport tunnels gives him leverage over Earth's food supply. As Jansen seeks to confront Bareen, he struggles with his identity and the moral implications of his mission. The climax unfolds dramatically as Jansen ultimately confronts Bareen in a life-or-death struggle, leading to a resolution that has implications for both his future and that of Earth. The story blends action, suspense, and ethical dilemmas, making it a compelling read for fans of science fiction. (This is an automatically generated summary.)