The Twisted Throne by Danielle L. Jensen

Ahnna is haunted by the destruction of her homeland so when the wealthy kingdom of Harendell claims her as a bride for its crown prince, Ahnna is prepared to do whatever it takes to gain influence as the future queen.

But she soon discovers that beneath the beautiful surface of Harendell's court lurk dark secrets and the only person who she feels she can trust is not her future husband, but his infuriating half brother, James.

And it isn't long before Ahnna finds herself attracted to a forbidden prince . . .