Eleanor Oliphant is Completely Fine by Gail Honeyman

There has been a trauma early in Eleanor's life that, as the reader, you think you have figured out.  It has made  her a decidedly socially awkward person. She has a job she does quite well but is the butt of many office jokes.  She spends her weekends drunk so she won't have to think about how lonely she is. All of that changes.  Eleanor's directness is in humorous conflict with a world that seemed to function more on politeness than truth but there is also a lot of sadness.  It turns out that one friend can make all the difference in the world.