Book 4 of 4 of The Murderbot Diaries tells of the humanization of Murderbot, a weaponized cyborg that became self-aware, one stop forward by making him… care about Dr. Mensah, who is in grave danger. But is Dr. Mensah his owner or friend?
While this book could be a standalone, I would highly recommend reading the first two. This novella would make a lot more sense, and would be much more enjoyable instead of reading it as a standalone book.