complicates things,

Paper and Fire: The Great Library - Rachel Caine

Lots of things that happened in the last book come to fruition in this and things just keep getting complicated. The Library has complex politics and the backstabbing is powerful. Our heros are finding more about what they can do in this world and how they can fight the system. This is a very interesting concept and world and I'm very curious as to what's going to happen next.