This is a screenplay. It reminds me a bit of Event Horizon. I picked it up because I was interested in reading a few screenplays to get the feel for them, and also because I know Ty Johnston's writing and have greatly enjoyed it in the past. This was fast paced and certainly held my interest. A surprising amount of characterization is achieved despite the screenplay format. The story takes place on a ship in orbit around the moon Io, and the crew finds they have something aboard that is not supposed to be there. It combines science fiction and horror, which are a natural match if you ask me. This would definitely look pretty good filmed.