The Clone in the Closet. The Tony Mandolin Mysteries, #6

Does a clone have a soul? Or just a killer instinct?In the fog-shrouded streets of San Francisco, where the supernatural lurks behind every alleyway and the line between myth and murder blurs, Tony Mandolin has faced vampires, witches, and worse. But when his business partner and housemate, Frankie, sees a copy of himself, and the police come crashing in to arrest the said housemate-Tony's world gets a whole lot weirder.
The twist? Frankie has proof he was miles away at the exact moment of the crime. Same face, same voice, same DNA. But in a city where fairies plot in the shadows of Chinatown and trolls guard the Golden Gate, Tony knows better than to trust appearances. Teaming up with his former cross-dressing partner Frankie-whose fists hit harder than a cable car-and the ever-skeptical SFPD Captain Pat Monahan, Tony dives into a story that reaches from dark alleys in the Mission District to hidden enclaves of the Sidhe in Golden Gate Park.
Someone's mastered the dark art of human cloning, crafting perfect duplicates to commit the perfect crimes. And the original? Frankie's next on the list-unless Tony cracks the case first. The problem is, this case has a trail that crosses the dimensions, and to do that, he needs the help of a wizard, and Landau Bain is cranky.