Kell possesses the rare ability to jump dimensions, one of the last of his kind. Using blood magic to travel from Red London to White London to Grey London, he is tasked with being a diplomat between the cities. As a member of the Red London royal family, he wants for nothing. In his free time, he likes to smuggle items from one London to another, an act that is highly illegal and incredibly dangerous.
Before Kell's gift was so rare, there was a Black London. When corrupt magic overtook Black London, the doors were sealed to prevent it from spreading. Only those like Kell were left to travel the remaining cities. When a piece of the corrupt magic threatens the remaining worlds, Kell and Delilah Bard, a surprisingly talented pickpocket from Grey London, must work together to save their realities.
This book had everything I was looking for: a well-written female lead, an interesting magic system, and crossdressing thieves. The audiobook did not do the characters justice, and I recommend reading the book. A Darker Shade of Magic by V. E. Schwab (2015) is the first in the Shades of Magic trilogy followed by A Gathering of Shadows and A Conjuring of Light.