Intriguing story that starts in the aftermath of a tragedy

The cover caught my attention but the first look had me hooked. The author does an excellent job of writing a character that is going through grief after the death of her best friend. She feels guilty and is heartbroken. I'm curious to learn how Ella and Sawyer become closer as at the start they seem to hater each other. Especially Sawyer. I can't wait to read the rest!