the Crimson Crown

Cas Devlin kills people to survive. It's all he's ever known - get his assignment, kill the target, go back to base. He's just one in a sea of them, people all raised to kill and maim. So, he doesn't question it when he's tasked to infiltrate the palace, and kill the king. But he never in a million years thought that he'd fall in love. With said king.
Now, amidst the shifting allegiances and doubt, Cas has to make the most important decision he's ever made in his life. Kill the king...or risk execution.