Nome desconhecido

Guys, a while back I read a dark romance book where the "heroine" liked photography and had an abusive brother, and was also quite reserved. On the other hand, the "hero" was the captain of the school soccer team and the son of the town mayor (something like that) and super popular, seen as a good guy and everything. Well, they were actually kind of psychopathic killers and ended up becoming a very controversial couple. Throughout the book, they kill a few people, including her brother and his father. Even though I know all this, I simply can't remember the name of the book. If anyone can help me...