The cover has a large Leviathan type ship on the front.
It is set in deep space as the people on said ship have been living there for generations. They come across an abandoned ship and set out to check it out. There are several traps but it seems to be a human ship and they even find a lone woman. Unfortunately she turns out to be an alien and attacks. They end up on a planet where a factory/warehouse is found to contain bodies, they think were eaten/experimented on by the aliens. I thought the book was called Leviathan but can't seem to find it anywhere. I seemed to be an older book from the golden age maybe even up into the 70's but I haven't had any luck yet. Any help I could get finding this would be great,thanks.