Scheming With The Alpha Duke

Anais Marlee has been rejected by her mate named Grant Thompson, the young Alpha and the Marquess of Reasien, for having Omega blood. While she is wandering in the Enchanted Rain Forest, she comes to meet the nemesis of Alpha Marquess Grant whose name is Sylvester Callaway, the Alpha and the Duke of Ascian. He makes a proposal to her. If she becomes his Luna and his Duchess for a year, he will help her avenge her broken heart against her former mate. Then she can leave his pack after that.

What if after her Luna term, Sylvester won't allow her to leave? What if this is all just a trap and she is just being played by the cunning Alpha? How can she escape from him now? Or can she really be escaped from him?