Love Lethal, Death Divine By Jelena Dunato

When Liana learns that her beloved husband, Prince Amron, was killed, she uses her half-divine blood to strike a bargain: the gods will send her back into the past and give her three days to make Amron fall in love with her. If she succeeds, she gets him back. If she fails, she loses him, and her divine powers, forever.
Seventeen years earlier, Melia is forced by her controlling father to marry Amron on the brink of the biggest peace treaty in history. But Melia has her own plans: to destroy the treaty and carve a new future with her rebellious lover, Ferisa.
As Melia’s betrayal sparks a bloody conflict, Liana realizes the gods have deceived her: she must help Amron earn Melia’s trust, even if it means losing him, or the future won’t exist. And Melia must decide whether to reveal the truth, knowing it could cost her everything – or let the kingdom burn to ashes.
A dark fantasy story of love and revenge, Love Lethal Death Divine blends the history of Eastern Adriatic with Slavic folklore, set in the same world as Ghost Apparent and Dark Woods, Deep Water.