Nobody knows exactly what happened to the fabled civilization of ancient Atlantis. Was Atlantis, the incredibly advanced society of legend, destroyed by some super-science device that ran out of control? Did a massive earthquake or volcanic eruption sink the island nation? Or is Atlantis merely a cosmic joke played by ancient historians on gullible theorists millennia afterward?Time Patrol stalwart Ross Murdock and the others who protect Earths history have discovered evidence that someone has tampered with events in ancient Atlantis. Our heroes journey back to the ancient world disguised as seagoing traders with goods to sell to the Atlanteans. They soon discover that other strangers are on Atlantis: the Baldies, aliens who have destroyed technological civilizations throughout the galaxy. The aliens are bent on changing our history to prevent the rise of technology, but exactly what are they trying to accomplish on the legendary island? As tremors of the volcano intensify and time runs out, will Ross, Gordon Ashe, and the other time travelers be able to stop the Baldies plan?