Ruthless Vows Book 2, By Rebecca Ross

As war shadows the kingdom, Iris Winnow and Roman Kitt find themselves separated by duty, danger, and the magic that binds their fates. Iris fights to protect the front lines with her words, while Roman—lost between worlds—struggles to return to the life and love he remembers. Their letters, carried by enchanted means, become the fragile thread holding hope together. But as enemies close in and secrets unravel, both must decide how far they’re willing to go to reclaim each other and the future they were never meant to surrender.