Dawn of Darkness by Shari L. Tapscott

Princess Amalia of Renove expected to find plague and death when she and Rhys entered the kingdom of Draegan, but she didn’t realize she’d find herself in a nest of lies and deception.

Now the princess’s world is crumbling. She must learn to navigate a wicked court, where everyone wants something from her—including the one man she thought she could trust.
And Amalia isn’t the only one struggling. Newly betrothed Cassia finds herself torn between family, duty, and love. One wrong decision, and the Draeganish princess’s world could come to an end.

Time is running short for the two riven kingdoms. An army of darkness gathers, preparing to destroy the entire continent.
Little do any of the royals know there are more players behind the scenes. Whether they act for the good of the kingdoms, or their destruction, only time will tell…