The Iron Fey Series Novels

The Iron King (The Iron Fey 1) by Julie Kagawa
The Iron Daughter (The Iron Fey 2) by Julie Kagawa
The Iron Queen (The Iron Fey 3) by Julie Kagawa
The Iron Knight (The Iron Fey 4) by Julie Kagawa
Iron's Prophecy (The Iron Fey 4.5) by Julie Kagawa
The Lost Prince (The Iron Fey: Call of the Forgotten 1) by Julie Kagawa
The Iron Traitor (The Iron Fey: Call of the Forgotten 2) by Julie Kagawa