The Razor's Edge — Joseph Robert Lewis

Zelda Pryce uses the arcane sciences to build beautiful machines, devices that defy explanation, make her invisible, and even let her fly. They also let her to break into homes, banks, and museums with ease. But she's no thief. She's a security expert. After successfully burgling the Smithsonian, Zelda is hired to test the alarms at the British Museum in London using her copper wings and ingenious cloak. And that's where everything goes wrong. Caught in a trap between deadly arcanist criminals and the secret agents hunting them, Zelda teams up with a dashing English riskbender and a daring French alchemist to chase a dangerous thief from Notre Dame to Castle Frankenstein to the Taj Mahal. But if they can't catch the thief in time, every arcane device in the world could be destroyed, and thousands of innocent lives could be lost. This is a world where a Chekhov Gun is a revolver with a mind of its own and Occam's Razor is the most dangerous knife in history. At least it was, until a mad scientist made a sharper one.