This little-known story begins when more than a dozen people wake up in coffins. They find themselves in a small area made to look like part of a town -- it contains a fully stocked store and hotel, a car parked on the street (that doesn't run) -- and a bunch of plastic coffins, each containing a passenger from an international flight, each apparently snatched out of midair, since there is no flight wreckage, and all of them seem to be alive and unharmed.
The people slowly gather in the hotel and find themselves able to understand one another perfectly, even though they don't all speak the same language. None of them has any idea what they're doing in this new place, and there isn't anything for miles around their little settlement except a seemingly endless expanse of grass.
After several weeks of waiting for rescue that never arrives, a few of their number explore and discover that this mysterious land is also populated by a group of what appear to be medieval people and another group of what seems to be cavemen. That accounts for the human population on this island . . . the only other creatures around are the sinister metal spiders.
This story is as much mystery as it is science fiction, because these people must figure out how they got to this place, and why they were chosen. But they also have to survive.
Well worth checking out, if you can find a copy.