Red Sister by Mark Lawrence

Falsely accused of murder, eight year old Nona Grey is brought to the Convent of Sweet Mercy, where young girls are raised to be killers. But Nona is being hunted by powerful enemies from a crumbling empire. Beneath a dying sun, Nona must come to terms with her demons and learn to become a deadly assassin if she is to survive.

Mer by Joelle Sellner

After the death of their mother, Aryn and her family move to a new town, where she makes new friends and catches the eye of the hottest guy in school. It all seems to be going well for Aryn, until she discovers that her new crush, Adrian, may not actually be human, and that their lives are in danger.