Chris Moriarty 
Watcher in the Shadows [EPUB ebook] 

A fabulously imaginative historical fantasy.Publishers Weekly, starred review of The Inquisitors Apprentice At the turn of the twentieth century, New Yorks Bowery District becomes the scene of a terrible murder when the Klezmer King gets fried to a crisp by his Electric Tuxedoon stage! The Inquisitors apprentice, thirteen-year-old Sacha Kessler, tries to help find the killer, but the closer he gets to solving the crime, the more it sounds as if the creature that haunted him in his first adventure is back. Worse still, his own Jewish family is in danger. Sacha has avoided learning magic until now, but as his world falls apart around him, he changes his mind.