Ptolemy's Ghost: Part 3 of the Watchers trilogy

Lana was most definitely not the 'chosen one'. The universe had certainly not awaited her arrival since the dawn of time. The universe did not care. She did not, after all, take up very many atoms in the grand scheme of things. No, Lana had simply been the wrong sentient being, in the wrong place, and at the wrong time. And because of this, she now felt it was down to her to save the day...and the galaxy...and all the life within. The trouble was, much of this said life, including giant insects full of religious zeal, passive-aggressive crime lords and cyborgs with anger management issues, all wanted to take the life from her. And to cap it all off, her dreams were being haunted by the only person she had ever killed. This was not improving her mood. Maybe it would be better to just let everyone die. At least then she could get some peace.