The Sylvan and the Sand by Sarah M. Cradit

Marry your enemy. Dare to survive.

From the USA Today Bestselling Author of Kingdom of the White Sea comes a new series of standalone fantasy romance tales set in the same vibrant world: The Book of All Things. Disappear into this scintillating tale of mortal enemies forced into a perilous, passionate marriage.
Yesenia Warwick artfully dodges her father’s talks of marriage, set on proving she is just as capable as her brothers. Her three loves—kin, homeland, and independence—are all she needs.
Corin Quinlanden suffers under the cruel contempt of his ruthless father and brother as they scheme and plot from their castle in the trees. He’s given up wishing for happiness. A strategic marriage, far from home, is as high as he dare dream.
But the king of this realm has his own plan.
Everything the gilded Quinlandens have “earned” was stolen from the Warwicks. So when all the leaders of the realm are summoned to a celebration with the king, both houses approach this fete balancing on a sharp blade’s edge.
But the king’s celebration quickly turns to horror. The lords and ladies can only watch, helpless, as the devious king masterminds a series of marriages between their children, spinning the kingdom into chaos.
Brash, fearless Yesenia Warwick is now the unwilling bride of tender-hearted Corin Quinlanden. Neither her silver-tongued wit, nor her unmatched skill with daggers, can erase what has been done.
The choice ahead of her is simple, but impossible.

Embrace her dangerous new life in the den of her enemy, or send the kingdom to war.