When millionaire shipowner Alexander Morrison's yacht is suddenly dragged to a halt by an unseen force, a night voyage turns into a nightmare of deep-sea mud, musk, and helpless dread. Murray Leinster's The Silver Menace opens into a gripping science-fiction mystery where a strange silver tide begins as an oddity at sea, then grows into a living catastrophe that defies scientists, disrupts ships, and spreads from harbors to beaches, rivers, farms, and cities. At the center of the crisis are aviator Davis, the brilliant Teddy Gerrod, and Gerrod's equally capable Evelyn, whose scientific investigation of the microscopic, jellylike creatures reveals a terrifying ability to merge and multiply when threatened. As the world reels and governments struggle to contain panic, Davis's romance with Nita Morrison deepens under her father's suspicion and the shadow of the spreading menace. Domestic warmth, flirtation, and dark humor run against mounting global dread as the team races to understand the silver plague before it buries the earth beneath a shimmering, foul-smelling mass. Davis finally proposes a desperate answer: explosive concussion from the air. This edition has been fully restored with modern typesetting, custom cover design.