I've read a book once, a few years ago. It was an old book, I could tell by the page color and the text font on the cover, so by now it's at least ten years old, probably more. It was a bigger book, judging by the size, I'd say between 150 and 350 pages. I think the cover had a circle looking spaceship. I think I got it from a school library, or maybe one of those 'take a book leave a book' places. Can't remember if there was ever a sequel.
I remember that the main character was in some sort of space station, running from something. Then I think a little bit later he jumps into space (with a space suit on) and ends up on the side of a docking spaceship. He cleans a window, then continues on his way. I think the pilot of the spaceship is in the story more later.
I remember something about 'Titan', and I specifically remember they capitalized the T.
I think the story opens up with an evacuation from Earth or something? It's been a while since I read it. Think it ends with the pilot of the docking ship and the window washer on a new planet.
I'm pretty sure someone betrays someone in it.