Breathing Lies by Jessica Sorensen

The Avertonson brothers and I have been friends for as long as I can remember. They’re also twins, but where Foster is all light, Kingsley is darkness and danger.

I’ve been in love with Foster for a while, but the night I finally get the courage to tell him is the same night I nearly drown.
I don’t remember much about what happened, but when I come out of that lake, I’m not the same girl I was before I went in. I’m lost and confused, especially over how I was saved.

Foster insists he’s the one who swam into the water to save me. I want to believe him, but I keep having these dreams where Kingsley is the one who pulls me out. But both brothers swear it was Foster.
I’m not sure what to believe or why they’d lie, but I need to find out the truth. But the more I search for answers, the more I realize I don’t know the Avertonson brothers as well as I thought.