Eleanor Oliphant is Completely Fine by Gail Honeyman

Eleanor Oliphant is fine. At least, she knows that's what she's supposed to say if anyone asks. Socially acceptable behavior doesn't come naturally to her. She's been alone for almost as long as she can remember, but it's fine. People are all mean, irrational dullards who mock her behind her back anyway, so she doesn't need them. She works all day in accounts receivable, and then she goes home and chugs vodka until the voices in her head quiet down enough for her to pass out. That's been her life for years. And, if anyone asks, she's fine.

Then, one day, her life changes. She watches a musician perform at a work event, and it's love at first sight. She just has to make herself into wifely material first, and surely the second he meets her, he'll propose. Meanwhile, her office has a new IT guy, Raymond, and he's one of the least pleasant men Eleanor has ever met. He's overweight, with sloppy clothes and eating habits, and he walks weirdly. But for some reason he keeps talking to her. And for some reason... that's completely fine.

Will Eleanor marry the musician? Will she let Raymond be her friend? Will she finally let herself remember the horrors of her past? Find out in this veritable roller coaster of emotions. It's a surprisingly dark, sometimes funny, completely heartwarming read. I highly recommend the audiobook, because the reader is absolutely fantastic.