Julie Kagawa concludes the Iron Fey series with The Iron Knight, which is told from the Winter prince, Ashallyn' darkmyr Tallyn's point of view. This is a departure from the previous convention where Meghan Chase, now the Iron Queen, was the narrator. Ash is on a quest to become human so he can be reunited with Meghan once again. This is due to the fact that all Summer and Winter faeries are weak against the properties of iron.
In this book, Ash's bitter feud with Summer court jester, Robin Goodfellow aka Puck, is explained. Puck was blamed for the death of Ariella Tularyn, Ash's first love. However, it seems that Ariella had been alive all along as a Seer, and she could be the key to Ash's quest to earn himself a soul. For that to take place, Ash has to submit himself to a series of tests. During one of these tests, he is shown a vision of the future, foreshadowing the birth of his son.
Love conquers all: Ash sets out on a perilous journey to earn himself a soul in order to be with Meghan Chase, now the Iron Queen.
Kagawa borrows extensively from Shakespeare and various mythological traditions in shaping the various characters in the Iron Fey series. She has successfully blended them into a universe called the Nevernever, which essentially is the realm of dreams. The Bone Witch is reminiscent of Baba Yaga, while the Big Bad Wolf is said to be the stuff of legends.
In The Iron Knight we see a mixture of "Happily Ever After" and "Ultimate Noble Sacrifice" endings, as one of the characters has to die in order for Ash to earn his soul and be with Meghan again. The epilogue is written from Meghan's point of view.
Fans of the fantasy/adventure genre (think JRR Tolkien's The Lord of the Rings series) would love this one as it is a classic piece about a mythological hero setting out on a quest with friends, facing various demons along the way but overcoming the odds despite the great personal cost.