All the Devils (Sisters of the Occult #1)

On the day of the funeral Andy is shocked to discover one thing- the person in that casket is not her sister. Violet is alive. Convinced her sister's elite boarding school is covering up the truth, Andy enrols at Griffith Academy to discover what really happened and find Violet. After discovering a cryptic note from her sister, Andy must follow a set of clues to unlock the truth. This will bring her into contact with secret societies, ancient magic, demons and monsters. And a charming senior named Jae Han who has his own reasons for finding out what happened to Violet . . . Soon Andy realises the price she must pay to bring her sister home is darker and more dangerous than she ever could have imagined.