He's the Black Mage and she's the traitor to the Crown.

Ryiah's world was shattered the night she discovered King Blayne's nefarious plans. Now, she has to betray the one she loves most in order to save the realm from war. Torn between love and duty, Ry finds herself on a perilous mission to help the rebels and convince the kingdom of Pythus not to honor its pact with the corrupt king of Jerar--all the while deceiving the most powerful mage in the realm, the very man sworn to protect the Crown and hunt the rebels at all costs: her husband.

She's one step ahead, but...