Marionette - The Dark Carousel, #3

The DARK CAROUSEL series is a heart-stopping mix of American Horror Story and the fantastical elements of Miss Peregrine's Home for Peculiar Children. A shattering betrayal leaves Cassie beyond all light or hope. The betrayal signals a return to Balthazar's castle. She's forced to wait out her sixteenth summer in Balthazar's terrifying, dank quarters beneath the castle, until he wakes from his long slumber and she is taken as his bride.
Each day she is reminded of her fate, in full view of the sixty glass door cabinets where his teenage wives of centuries past are preserved. No bride lasts very long. Each day, she is told she is little more than a butterfly, soon to waste away inside a painted, wooden replica of herself. Deep inside herself, she plots revenge against those who have taken everyone she loved away from her. And she'll never stop seeking a way to destroy the second book of The Mirrored Tree--the knowledge of which will give the castle dominion over all the universes.