What's the Name of That Book??? discussion

So I read this book around 2020, and not knowing the name of it has been bothering me for months. From what I remember, it was written by a male author. The plot is as follows-- two men live in the sewers below a large city because they are different. They scavenge for food at night and have to stay hidden because people/society will try to kill them. Years go by and the older man dies. The younger man witnesses a young woman being attacked in a library at night by some strange men. She is trying to find her father's killer and she has a severe touch aversion. They go on an adventure around the city together to try to find her father's killer. Here is where my memory gets fuzzy. There is also an element of the supernatural/angels from what I remember? At the end it turns out that the reason that the men had to hide is because they were too beautiful? The very end of the story culminates in a plague or virus of some kind.

I don't suppose the "Sewer Scene" list has caught it? It's not very long, if you care for a scroll! :)
https://www.goodreads.com/list/show/1...

Innocence-Dean Koontz

Yes it's Innocence!! Thank you so much! As I said this has been bothering me for months because I absolutely despised this book haha.

Glad I could help! I found it rather 'meh' myself.