You Are So Not a Fallen Angel

When Lorris falls out of the sky and saves Eliza's life, before disappearing into the night, she's convinced he's the thing she's been waiting for her entire life: quite literally, the angel who will take her away from this boring, stifling life she has been living for so long. And it's not long before he has swept her up in a whirlwind of excitement and the previous tedium of her summer is long forgotten.
But is Lorris all he claims to be? Is he really an angel, come to save her, or is he something else entirely?