Book — Kaylie Smith

When Ophelia’s sister disappears, there is only one way to save her. Ophelia must enter Phantasma, a deadly contest inside a haunted mansion, and claim its prize—a single wish.
Phantasma is a maze of twisting corridors and lavish ballrooms, of demons and temptations. Ophelia will face nine challenges, each more dangerous than the last. There can only be one winner, and the other contestants will stop at nothing to eliminate their rivals.
Every day the house creates new monsters. But just as Ophelia’s fears threaten to overwhelm her, a mysterious stranger offers her a bargain.