Books that are subtly creepy, that make you do a double take

I recently started reading a book that reads completely normally but then there's a sentence here or there that is wrong and catches me off guard and I say "wait a sec did I read that right? what's going on here"

I feel like subtlety makes creepiness that much more creepy. I hate when books bash you over the head with obvious "scary" elements that don't scare anyone. I want to be a frog enjoying a warm bath as the horror slowly turns up. I want to second guess myself and say "that was probably nothing" and then when I realize what's going on its far too late.

Any books like this?