As on a Darkling Plain Author:Ben Bova The alien machines stood on Titan, Saturn's largest moon. Housed in huge buildings that made the space explorers from earth look like insects, the machines continued to function as they had since beyond recorded time. Yet what their purpose was, and who built them, was a maddening, terrifying mystery. — Dr. Sydney Lee was convinced that these m... more »achines had been designed to destroy man, and unless the power that drove them and the beings that controlled them were discovered, they would succeed. But there was just one way to prove his theory. Dr. Lee and his chosen crew were frozen, and placed in a space ship to a distant star. When they returned to life, fifty years had passed. They were no older, but the time they had to find and destroy their enemy was perilously short...« less
Pretty good old-style scifi. Humans have discovered ancient, but working, machinery on one of Saturn's moons and have been unable to discern their purpose. One man devotes his life to tracking down the source of these machines, but is sidetracked into a mission to another star. After finding traces of ancient human civilization on this other star, he becomes convinced that the machinery is malign, and returns to Saturn to solve the riddle.
The characterization is mediocre, and the author has definitely hand-picked the scientific principles he wishes to believe, but the story is a fun adventure read.