As On a Darkling Plain

Scientist, hardheaded administrator, adventurer to the stars: Sidney Lee would be these things and more, to break the alien code of the vast machines that sat, motionless, on Titan.

To some, the implacable machines were dead - but mysteriously self-maintained - relics of a galactic civilization long gone. But to Sidney Lee the awesome machines were a terrible challenge. For generations countless scientists had tried - and failed - to divine the purpose of these monolithic hulks that dominated the plain of Jupiter's moon.

With stubborn conviction that bordered on madness, Sidney Lee believed the machines weren't dead, but waiting...

And the secret of that waiting could spell mankind's doom!