The Spacejacks, a novel by Robert Wells. Ryder's Recovery Systems United was just trying to stay in business, getting to space wreckage faster than the competition. When a mammoth, mysterious starcraft began showing up near Earth giving evidence of possessing that impossibility, faster-than-light speed, Trix Ryder thought that her father's business was in deep trouble. Soon enough, though, it become evident that it wasn't merely the Ryder's spacejacking operation that was threatened... it was the entire world!