Harrow

Sixteen-year-old Brenna doesn't believe her vivid imagination can hurt her, until she wakes up in a church, covered in blood. Blood that isn't hers.
She thinks her life can't get much worse, but when she finally finds a way to escape her abusive home, her imagination turns to nightmarish hallucinations.
Niven likes staying inside the abandoned church, hiding from his violent father. The two bond through art and misery, but Brenna knows good things in her life don't last long.
Her delusions take a horrific turn when she thinks she sees two men gruesomely murdered by a monster in the church basement, but in the end, she's the one with blood on her hands.