I've blogged before about how I love the 13th Floor series by Christine Rains.
For X I'm going to use Xan.
Fine let me tell you about Xan.
Xan is short for Xanthus and he's a dragon slayer. A dragon slayer in a time where they are no longer celebrated as heroes but are outlaws. Xan knows that dragons never went extinct. They evolved with human society and took on mortal form. When Xan does his job properly he is seen as an assasin.
Trouble is he missed his mark. Now the dragon knows he's gunning for him and Xan must make a plan to slay the dragon or risk its retribution.
This is an awesome series. I love the inhabitants of the 13th Floor.