Traitor (Creepy Hollow, #3)

Violet and Nate may have escaped the labyrinth, but only one of them came out unscathed. Nate is now the bearer of a mysterious eye-shaped tattoo, a mark he has no memory of receiving and no desire to investigate further. But Vi has never been one to let a mystery go unsolved, and she’ll do whatever she can to discover who’s behind the tattoo—even if it means leaving Nate out of her plan.