There are 5 books in the Old Kingdom series. The newest book is Goldenhand which came out in 2016.

A stunning anniversary gift edition of the second in the bestselling Old Kingdom fantasy series.

Sabriel has spent most of her young life far away from the magical realm of the Old Kingdom, and the Dead that roam it. But then a creature from across the Wall arrives at her…
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Sequel to the spellbinding, award-winning fantasy adventure, SABRIEL. Lirael has never felt like a true daughter of the Clayr. Abandoned by her mother and ignorant of her father's identity, Lirael resembles no one else in her large, extended family living in the Clayr's Glacier. She doesn't even have the Sight…

3
Abhorsen

Book cover of Abhorsen
Beneath the earth, a malignant force lies waiting, greedy for freedom from its ancient prison. As the Old Kingdom falls once more into a realm of darkness and terror, the people look desperately to the Abhorsen, the scourge of the Dead, to save them. Yet Abhorsen Sabriel is lost, missing…

4
Clariel

Book cover of Clariel
Clariel is the daughter of one of the most notable families in the Old Kingdom, with blood relations to the Abhorsen, and to the King. When her family moves to the city of Belisaere, Clariel finds herself at the centre of sorcery and intrigue: a plot is brewing against the…

5
Goldenhand

Book cover of Goldenhand
Lirael is no longer a shy Second Assistant Librarian - she's now the Abhorsen-in-Waiting, with a new hand, one of gilded steel and Charter Magic. When she discovers Nicholas Sayre lying unconscious, she uses her powers to save him. But the attack has left Nicholas tainted with Free Magic, so…