Eyes of the Empress — Camille Bacon-Smith

THE DOWAGER EMPRESS' CRYSTALS
were vanishing. Two of the three known crystals had already disappeared, despite the high level of security at the Smithsonian and University Museums. It was obviously only a matter of time until the unknown thief attempted to snatch the third crystal from Philadelphia's Art Museum. That was why Art Professor and Board member Harry Li wanted to enlist the aid of Bradley, Ryan, and Davis, Private Investigators, the most unique detective agency in Philadelphia. And though Harry had no way of knowing it, he'd definitely chosen the best investigators for the case--and not just because they specialized in solving cases of art theft and fraud. Rather it was because Kevin Bradley and Evan Davis were not the mere mortals they appeared to be. Brad was a powerful demon, and Evan was Brad's half-demon/half-mortal son.

So solving mortal crimes ought to have been a cinch for them. But they soon realized that recovering the crystal orbs of the centuries' dead Dowager Empress of China was not going to be an open-and-shut case. For the crystals were far more than simple objets d'art, and the unknown thief would prove a dangerous adversary even for those able to draw upon powers far beyond anything known in the mortal realms....