The universe wreckers

A narrator employed at the World Government's Intelligence Bureau recounts how astronomers detect an abrupt increase in the sun's rotatory speed and struggle to explain it. Growing alarm prompts an investigative mission to the outer planets to determine whether external forces or internal solar changes are responsible. The expedition reaches Neptune and finds a hauntingly lifeless globe dominated by vast, compartmentalized cities, strange constructions, and colossal enigmatic devices that imply ancient machinery or deliberate ruin. The account traces the explorers' attempts to understand these discoveries and their search for the cause and consequences of a threat affecting the solar system.