The Dragon's Mark (Rogue Angel #26)

Archaeologist Annja Creed and her sword have never been outmatched— until now. When a surprise party for her mentor Roux includes some uninvited guests, Annja finds herself fighting desperately for her life. The intruders escape but leave a sinister message behind. A legend has resurfaced about a sword that should be feared. A sword that seeks a master as bloodthirsty as itself. It is wielded by an assassin known as the Dragon who initiates a terrible game of cat and mouse. Eventually, the two swords—light and dark—must meet…and only one shall triumph.