The Time Valve

In an earlier story (“The Fitzgerald Contraction”), survivors of the sinking of Mu (or Mo, as they called it) travel into space at relativistic speeds only to return to Earth some 200,000 years later. That, of course, is mere time dilation rather than time travel; but in this sequel, the Moans along with present-day beauty Vayill continue even further into the Earth’s future where trouble ensues until Vayill’s aged father comes to the rescue with a real time machine in an airplane.