Oh, it's You

Lily didn't want to be at Mary's party. Not even their public-school-forged friendship could make her want to attend a party she knows her ex-boyfriend will be at, with his new girlfriend. Much less, a Halloween party where she is 1/3 of an enforced group costume. When Lily encounters a former-acquaintance/nemesis, things will change for her in ways she could not have expected.