"The Silver Menace" by Murray Leinster is a science fiction novel written in the early 20th century. The story revolves around Alexander Morrison, a wealthy steamship magnate, and his daughter Nita, who find themselves trapped on a yacht amidst a menacing phenomenon that turns the ocean’s surface into a strange, jellied mass. As they grapple with the mysterious force slowing their yacht and threatening their safety, a seaplane dispatched for rescue reveals that the enigma extends far beyond them, affecting the world at large. At the start of the narrative, the yacht owned by Morrison is navigating the ocean when it suddenly experiences a significant drop in speed. Morrison and Nita initially find the situation puzzling, but their concern grows as the yacht's engines struggle to overcome an invisible force, adorned with an unpleasant odor reminiscent of deep-sea mud. The plot thickens as the vessel stops moving entirely, leading to a frantic wireless call for assistance. Meanwhile, in a parallel storyline, Flight Commander Richard Davis receives the distress signal and prepares his seaplane to investigate the peculiar predicament. As both threads intertwine, the implications of the "Silver Menace" become painfully clear, escalating into a collective threat to humanity that Morrison, his daughter, and Davis must confront. (This is an automatically generated summary.)