I'm looking to read up on an old book I read. It was a novel/book about an alien species stopping a Boeing plane to scan it for another alien species which was hiding on the plane.
One species was more technological, the other was more biological, I believe they were some kind of silvery metallic liquid that could change form and they infected other species. But I can't remember the name. It started with a passenger plane being stopped mid air, and is from the perspective of a human person. Some of the plot points involve the protagonist being chased by the hostile alien and taken to a facility to cure them.
