Plain Jane is actually a very human looking alien, but in this story there are lot of aliens, most of them too human looking to be believable. At least in her case, we know that she was deliberately modified to look human, her race always tries to modify themselves to look like those around them. She can also be taken over by an implant in her brain that can control her to perform amazing physical feats that she cannot perform under her own control. She has tried all her life to attract as little notice as possible. We know very little else about her history.
The plot begins with her being attacked by an assassin robot while the human race's greatest hero happens to be walking by at the time and saves her. He then develops an interest in her, though not an explicitly sexual one. He soon finds she is much more than she seems and they begin an adventure trying to get away from the assassin, then ever escalating threats in ever more distant realms. It's a decent adventure, not excessively violent and with enough twists and turns to be interesting. It involves the galaxy's formerly greatest race, which she seems to be a member of, and the vicious killer race that destroyed them.
The characters in this realize that they are sexual beings, but there is no sex at all. The prose and proofreading are fine, not perfect but nothing that detracts from the story. This is not a science based story and some of the things, like the hero's 'armor' probably aren't going to come about but again, it is nothing that detracts from the story. The story doesn't end in this volume. The volume doesn't quite end in the middle of a sentence, but in a double cliffhanger in an effort to get you to spend $3.99 for the next volume.
(review of free book)