Clariel: The Lost Abhorsen is the fourth book in the Old Kingdom series. It takes place 600 years before the events of Sabriel, and focuses on Clariel, now known as Chlorr of the Mask, who was formerly a member of the Abhorsen family. It was published in October 2014 together with an Amazon Kindle and audiobook edition. The Audio Book will be released by Listening Library that also released the earlier audiobooks.